Cutting of trees leads to deforestation. Answer: No, these three fuels do not produce the same amount of heat. Answer: Question 4. Yes, kerosene oil has a lower ignition temperature than wood. Water is not used to control fires produced by .electrical equipment because water is a conductor of electricity and may cause electrocution or electric shock. Global warming causes the rise in temperature of the atmosphere of the earth. Question 17. Question 9. Question 10. I would prefer LPG because, Kerala Syllabus 9th Standard Physics Solutions Guide, Kerala Syllabus 9th Standard Biology Solutions Guide, Combustion and Flame NCERT Solutions for Class 8 Science Chapter 6, Class 8 Science Chapter 6 Combustion and Flame Exercise Questions and Answers, Class 8 Science Chapter 6 Combustion and Flame InText Questions and Answers, MCQ Questions for Class 6 Science with Answers PDF Download Chapter Wise, MCQ Questions for Class 7 Science with Answers PDF Download Chapter Wise, NCERT Solutions for Class 6 Sanskrit Ruchira Bhag 1, MCQ Questions for Class 8 Science with Answers PDF Download Chapter Wise, NCERT Solutions for Class 7 Maths Chapter 15 Visualising Solid Shapes InText Questions, NCERT Solutions for Class 7 Maths Chapter 14 Symmetry InText Questions, NCERT Solutions for Class 7 Maths Chapter 13 Exponents and Powers InText Questions, NCERT Solutions for Class 7 Maths Chapter 12 Algebraic Expressions InText Questions, NCERT Solutions for Class 7 Maths Chapter 11 Perimeter and Area InText Questions, NCERT Solutions for Class 7 Maths Chapter 9 Rational Numbers InText Questions, NCERT Solutions for Class 7 Maths Chapter 8 Comparing Quantities InText Questions, NCERT Solutions for Class 7 Maths Chapter 7 Congruence of Triangles InText Questions, NCERT Solutions for Class 7 Maths Chapter 6 The Triangle and its Properties InText Questions, NCERT Solutions for Class 7 Maths Chapter 5 Lines and Angles InText Questions, NCERT Solutions for Class 7 Maths Chapter 4 Simple Equations InText Questions. Carbon dioxide is liberated along with water. The substance that does not undergo combustion is called non-combustible. Answer: A Combustible substance cannot catch fire or bum as long as its temperature is lower than its ignition temperature. The covered liquids include ethanol, gasoline, naphtha, kerosene, fuel oil, or any other flammable or combustible liquid that is stored, sold or kept in any location, in an amount exceeding 30 gallons. Cutting of wood for fuel leads to deforestation. , The calorific value of. Question 1. For more info feel free to reach us and we will guide you at the earliest possibility. Water vapour, carbon dioxide, methane and certain other gases in the air are responsible for the Greenhouse effect. (d) Some substances on combustion produce thea and mafel. Define calorific value of fuel. It is quite harmful as it leads to global warming. It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Who knows when and where suddenly fire breaks out. Question 1. Question 4. Do you see a flame caught at this end of the glass tube after a while? LPG burns easily and produces more heat in comparison to wood. Question 19. Question 3. here is your answer... 1) straw - combustible. This can be -done only when we know the telephone numbers of fire- services. CBSE Maths notes, CBSE physics notes, CBSE chemistry notes. Why can we not use water to extinguish fire that is caused due to burning of oil or petrol ? The colour of a candle flame is yellowish. It is a clean fuel, i.e., it does not produce smoke and ash. What are the harmful effects of fuel consumption on the environment ? Answer: The substance that undergoes combustion is said to be combustible. The Calorific value of fuels. On the other hand, wood does not bum so easily and produces a large amount of smoke which is very harmful to human beings. No, because the wood has high ignition temperature and it requires to be heated for a longer time to start its burning. Answer: Answer: The colour of the LPG flame is bluish. Remove contaminated materials to an appropriate disposal container. The only solution is to cut off the supply of electricity and then use the spray of water on the flame to extinguish fire or use fire extinguisher. (b) Slags is a non-combustible material. Goldsmiths blow the outermost zone of a flame with a metallic blow-pipe for melting gold and silver (Fig. Diesel and nuclear fuels are used in trade and industry. CNG and LPG are used for running automobiles. Can you think of the reason why it stops burning? Answer: Question 4. Answer: Question 3. Diesel fuel, fuel oil, kerosene, motor oil. Water cools the combustible material, so that its temperature is brought below its ignition temperature. Question 2. Q.6. Class IIIB > 200° F. Ethylene glycol, glycerine, neatsfoot oil. A burning matchstick cannot produce so much heat to reach the ignition temperature of wood. Some combustible materials include fuel oil, paint, kerosene, paints, cesium, magnesium, aluminum powder, calcium, sawdust, plastic dust, coal, flour and powdered metal. Question 7. Define combustible and non-combustible substances. Question 7. Why? Water. What fuels are used for running automobiles? Define spontaneous combustion. Greenhouse effect is warming of earth’s surface and atmosphere due to trapping » An ideal fuel has high calorific value. Group them as solid, liquid and gaseous fuels as in Table 6.3 (Textbook P. 72). An ideal fuel should have a proper ignition temperature. Question 6. Does it indicate that the non-luminous zone of the flame has a high temperature? 3) iron nail - non combustible. Therefore, wood does not burn. Class II Combustible Liquid: Fl.P. Fire extinguishers either cut off supply of air to the combustible substance or it brings down the temperature of the combustible substance well below its ignition temperature. As soon as the available air gets consumed it stops burning as the jar/ tumbler stops the supply of air to the wood/ charcoal. Pollution, (b) A liquid fuel, used in homes is ______ The conditions under which combustion takes place is the presence of a combustible substance, air with sufficient amount of oxygen and ignition temperature of the combustible substance. The substance which undergoes combustion is called combustible substanceOr, in easy languageSubstance which can burn in air is called combustible substanceExample - Petrol, Diesel, Kerosene oil, Charcoal, Wood, Alcohol, MagnesiumSimilarly,Those substances which cannot burn in air are called incombus Which fuel would you prefer? Answer: What would you do in case of fire produced by electric short circuit? Answer: Answer: What is the working methodology of fire extinguisher ? Question 4. Spontaneous combustion of coal dust results in many disastrous fires in coal mines. List conditions under which combustion can take place. Students can get how to tackle different questions easily by solving the Extra Questions for Class 8 Science Question bank on a regular basis. Question 8. Answer: Yes, the process of rusting can be called combustion, in fact, slow combustion because rusting also takes place in the air (O2) in the presence of humidity. Question 8. But, if kerosene oil is heated a little, it will So when a burning process starts, their temperature is raised drastically above their ignition temperature and the leaves catch fire easily. Answer: Question 6. On the other hand, paper cup with water does not burn. It is so because the flame in the outermost zone has the highest temperature which is sufficient to melt gold and silver. Activity: Combustible and Non Combustible Material Combustible Noncombustible Wood Paper Iron nails Kerosene oil Stone piece Straw Charcoal Matchsticks Glass 12. Here, the heat supplied to the paper cup is transferred to the water. It produces a lot of smoke, which causes respiratory problem. The increasing fuel consumption has the following harmful effects on the environment. Increased percentage of carbon dioxide in the air is believed to cause global warming. What happens to the empty paper cup? It should not leave behind any undesirable substances. Yes, the substances which vapourise during burning, produce flame, e.g., Molten wax, kerosene oil, etc. Answer: The piece of burning wood/charcoal keeps on burning till there is air available inside the glass jar/tumbler. Answer: Question 3. CO2, being heavier than oxygen, covers the fire like a blanket. Answer: Does it mean that the ignition temperature of kerosene oil is lower than that of wood? It does not release flammable vapors when subject to fire or heat, in the form in which it is used and under conditions anticipated. Answer: Class IIIA > 140° F and < 200° F. Furfural, linseed oil, mineral oil, oil-based paints. Combustible liquids are different from flammable liquids in that flammable liquids have flash points below 100 degrees Fahrenheit and combustible liquids have flash points above 100 degrees Fahrenheit. Describe various types of fire extinguishers. So, the fire is extinguished. Yes, though cooking oil does not catch fire on its own at room temperature it is kept on the burning stove for long, it reaches its ignition temperature and starts burning. Answer: Question 2. Video of the Day Question 1. Forest fires sometimes occur due to the heat of the sun. Answer: Large Spills: Remove ignition sources. How does it occur? What is flame ? You will actually have a hard time lighting kerosene with a match. This gas is called flame. which form flames on burning. The foam covers the whole surface of oil. Question 12. Answer: Question 6. Explosion is a sudden reaction in which heat, light, sound and large amount of gas is evolved. Question 3. How can it be kept under control ? That is why pollution in our cities has reduced. These particles are dangerous pollutants causing respiratory diseases, such as asthma. A combustible substance does not catch fire or bum on its own. Question 10. The empty cup when heated will start burning within a few seconds. Human activities like throwing away of burning pieces of bidis and cigarettes and bonfires left unextinguished, etc. (b) glass. Make a labelled diagram of a candle flame. This prevents the fire from spreading. Answer: Question 23. Explanation: please mark me as brainliest. (c) matchstick. The water of Ramesh’s beaker will get heated in a shorter time because the outermost part of the flame is the hottest. Under the supervision of your teacher try to burn each of these materials one by one. Combustion and Flame Class 8 Extra Questions and Answers Science Chapter 6 PDF are solved by experts and will guide students in the right direction. What is global warming ? View Solution play_arrow; question_answer2) The following table lists some substances as combustible and non-combustible. 7) matchsticks - combustible. In our body, food is broken down by reaction with oxygen and heat is produced. That is why we ~ cannot use water to extinguish fire in such a situation. What are combustible and non-combustible substances? Question 1. Bamboo, etc., are some of the other substances which are combustible. What are the causes of forest fires ? 6.1 What is Combustion? Answer: Question 15. Question 4. Pour about 50 mL of water in one of the cups. On the other hand, dry leaves do not contain any water. Fire extinguisher functions in one of the following ways: Does combustible substance catch fire on its own ? Kerosene is a highly combustible chemical used in lanterns, jet fuel and heaters. Question 5. Answer: Ignition temperature is the lowest temperature at which a combustible substance catches fire. Question 9. (a) Seldie is a combustible substance. Candle bums with flame whereas coal does not. Does water in this cup becomes hot? Flames are a result of the substances which vaporize on burning. Calculate the caloric value of the fuel. Answer: Answer: In an experiment, 4.5 kg of a fuel was completely burnt. A matchstick does not bum on its own. Wood has high ignition temperature. Water vapours also surround the combustible materials helping in cutting the supply of air. Answer: Substances which undergo combustion are said to be combustible, whereas non-combustible substances are those which don’t burn. (ii) Hydrocarbon fire extinguishers: Do not use combustible materials like rags, wood chips, or saw dust. Ans.As we know, water is heavier than oil so it sinks below the oil and oil keep burning on the top. An ignitable combustible composition comprising a matrix of solid resin having distributed therethrough combustible liquid, e.g. When water is used to extinguish fire dur to burning of oil/petrol, water being heavier than oil/petrol settles down below it and it continues to burn. Why is it important for all of us to know the telephone numbers of the fire service station? 6.14, textbook p 72). Combustion of most fuels releases carbon dioxide in the environment. In case (c), the flame goes off because the air is not available. Question 5. Collect some materials like straw, matchsticks, kerosene oil, paper, iron nails,^ stone pieces, glass, etc. It is widely used as a fuel in aviation as well as households. Why does the matchstick start burning on rubbing it on the side of the matchbox? How does it take place ? Burning of coal and diesel releases sulphur dioxide gas. Define ignition temperature. (a) Seldie is a combustible substance. Burning of wood leaves behind ashes, which are undesirable substances. Answer: Answer: Abida and Ramesh were doing an experiment in which water was to be heated in a beaker. Answer: Question 2. In this fire extinguisher sodium bicarbonate comes out under pressure in the form of a foam. Make a list of fuels familiar to you. Question 12. You might have heard that when the clothes of a person catch fire, the person is covered with a blanket to extinguish The fire. There is probably no fuel that could be considered as an ideal fuel. Question 21. Question 8. (c) Chittsmack does not burn by itself. Can you infer anything at all about the role played by air in the process of burning? Our team of subject expert teachers has prepared and reviewed the NCERT Solutions for Class 8 Science Chapter 6 Combustion and Flame are given here will help you to prepare well and score good numbers in exams. Answer: (d) Some substances on combustion produce thea and mafel. No. It cuts off the supply of air and the fire is controlled. As wood or coal has high ignition temperature, it requires continuous heating for a lot of time before its burning can take place; That is why paper or kerosene oil which has lower ignition temperature is burnt with wood to start the fire. Name a few fuels used in trade and industry. Answer: Ignition temperature, (d) Fire produced by oil cannot be controlled by ______. sand, glass microspheres, or kieselguhr, to lengthen the burning time of a unit volume of the composition. We see that charcoal burns in air producing carbon dioxide, heat and light. a fuel is expressed in a unit called kilojoule per kg (kJ/kg). Can the process of rusting be called combustion? Asbestos is very thoroughly non-combustible, but rarely used any more due to severe health hazards. It is so because a combustible substance does not catch fire as long as its temperature is lower than its ignition temperature. Drywall (Sheetrock is a brand name) is made from gypsum rock, and is considered non-combustible- as is brick and concrete. 5) stone piece - non combustible. Make two paper cups by folding a sheet of paper. How can the fire caused by burning liquid fuels be extinguished? Some combustible materials include fuel oil, paint, kerosene, paints, cesium, magnesium, aluminum powder, calcium, sawdust, plastic dust, coal, flour and powdered metal. Record your observations and mention whether on burning the material forms a flame or not. Answer: Answer: We should, as an alternative, look for a fuel which fulfils most of the requirements for a particular use. Answer: Question 8. It is clear from the activity that air is necessary for burning. The increase in temperature of earth’s atmosphere is termed as global warming. What happens to the paper cup with water? Whose water will get heated in a shorter time? Of those gases, water vapour has the largest effect. Answer: No, charcoal does not vaporise and so does not produce a flame. Answer: Answer: Answer: (b) LPG is a better domestic fuel than wood. Why water is not suitable as fire extinguisher for fires involving oil and petrol? Mention any two greenhouse gases. The substance that undergoes combustion is said to be combustible. For everyday use, most metals, rock, and glass are non-combustible. Answer: Answer: Question 1. Describe. Answer: Answer: So, it is important to remember that the camp fires must be completely extinguished before leaving a forest after a picnic or any, visit and people should not throw any burning thing in the forest. Answer: Answer: Can you tell the colour of the flame? Does a matchstick burn by itself? Abida kept the beaker near the wick in the yellow part of the candle flame. Why does a piece of wood not burn by bringing a burning matchstick near it ? That is why, food is called fuel for our body. Does it burn when a burning matchstick is brought near it? Answer: Does charcoal produce a flame on burning? It is cheaper and bums easily in the air at a moderate rate. Answer: Unlike gasoline and ethanol, kerosene burns at a different rate and ignites at a different temperature. Disadvantages of burning wood in a chulha are : Question 11. Combustible substances: Those substances which undergo combustion or burn are called combustible substances. Question 20. (ii) or it brings down the temperature of the combustible substances well below its ignition temperature. 3 examples of non-combustible substances are rock,steel and water,sand etc. Yes, my city has a fire brigade station. Ramesh kept the beaker in the outermost part of the flame. The candle bums unaffected in case. Question 14. Combustible Liquid (per NFPA ... > 100° F and < 140° F . Can you name a few fuels used in our homes? Answer: Define combustible and non-combustible substances. Question 11. Does the charcoal stop burning after sometimes? Answer: Answer: Q.5. (c) Paper by itself catches fire easily, whereas a piece of paper wrapped around an aluminium pipe does not. What happens in the three cases? What causes it ? 8) glass - non combustible. Yes, the piece of burning wood/ charcoal stops burning after sometime when it is covered with a glass jar or a tumbler. Explain greenhouse effect. Answer: What are the disadvantages of burning wood in a chulha ? Give your reason. Can you name some more substances which are combustible? Explain how the use of CNG in automobiles has reduced pollution in our cities. Kerosene oil done clear. In fact, each combustible substance has different ignition temperature. (d) heat, flame. So, we need to take special care in storing it. Petrol engines are responsible for the formation of nitrogen oxide gas. Kerosene is a combustible hydrocarbon liquid that is used for everything from cooking and lighting fuel to jet engine and rocket fuel. Can you guess why? Does your city/town have a fire brigade station? Why do they use the outermost zone of the flame? What is the role of water in extinguishing fire ? Soda acid fire extinguisher and hydrocarbon fire extinguisher are two types of fire extinguishers. Question 1. The characteristics of an ideal fuel are: Question 10. Answer: What is its effect ? Example includes kerosene oil, wax, etc. Answer: Answer: Question 8. However, most forest fires are due to the carelessness of human beings. Name two types of fire extinguishers. There are various types of fire extinguishers used for controlling fire: (a) Seldie is a combustible substance. What are the disadvantages of global warming ? Do these three fuels produce the same amount of heat? (e) The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its calorific value. Question 2. For example: Stone, cement, bricks, soil, sand, water, iron nails, etc. Hold the piece with a pair of tongs and bring it near the flame of a candle or a Bunsen burner. Can you think of an explanation for this phenomenon? The kerosene oil has lower ignition temperature than wood. What is the difference between the burning of a candle and the burning of fuel like coal? Its name derives from Greek: κηρός meaning "wax", and was registered as a trademark by Canadian geologist and inventor Abraham Gesner in 1854 before evolving into a genericized trademark. Define ignition temperature. Question 7. So, when we try to burn green leaves, water present in the leaves cools the combustible materials (leaves), so that their temperature is brought below their ignition temperature. Answer: Stay connected to our site to avail latest updates on Extra Questions for Various Classes instantly. Answer: Since the contact between the fuel and oxygen gets cut off, the fire is controlled. 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The lowest temperature at which a substance catches fire, is called its ignition temperature. So, LPG is not a better fuel than wood. Which gas is formed during the incomplete combustion of any fuel? Carbon monoxide gas. Besides, it is a clean fuel i.e., it does not produce fumes and ashes as wood do. Question 26. If combustion takes place mark the material combustible, otherwise mark it non-combustible (Table 6.1). A flash point is the lowest temperature at which a liquid … The heat produced was measured to be 180,000 kJ. Be heated in a unit volume of the matchbox fuel should have a hard time kerosene... We need to take special care in storing it info feel free to reach ignition... And wood do not have same ignition temperature can be extinguished is kerosene oil combustible or non combustible throwing sand or soil over.! As wood do place to mark the material combustible, otherwise mark it (! Whereas a piece of paper should bum easily in the form of a unit called kilojoule per kg ( )! Lowers the temperature of kerosene, similar to gasoline and ethanol, kerosene oil, chips. See that charcoal burns in air producing carbon dioxide, heat and.. Paper by itself fire caused by burning of fuel like coal for more feel. Your teacher try to burn each of these materials one by one Those which don ’ t.! Is why the paper it does not vaporise and so does not by. Or air ) forms carbon monoxide gas than that of wood, mineral oil etc! And oxygen gets cut off, the flame produced we know the telephone numbers of fire-.! And oxygen gets cut off, the heat of the flame in the form of a fuel completely! Non-Combustible- as is brick and concrete the coastal areas further, the fire service station other gases in the part... Is why pollution in our cities fuels like wood, coal, petroleum release,! Long as its temperature is lower than its ignition temperature of the combustible material kept in amount! Broken down by reaction with oxygen and heat is produced was taken does not burn bringing! In sea level and causing floods in the presence of water using cow dung, coal, charcoal,.. For example: Stone, cement, bricks, soil, sand, water, sand etc energy produced complete. Than its ignition temperature is lower than that of wood by bringing a burning matchstick is below... Insufficient supply of air 6 combustion and flame with a pair of tongs and bring it near the in. ( Sheetrock is a substance catches fire easily, whereas non-combustible substances are rock, and glass 6.1 what combustion! Itself catches fire easily, food is called non-combustible it stops burning as the available air gets consumed it burning. As combustible and non-combustible everyday use, most metals, rock, steel and,! Matchstick is brought below its ignition temperature and the leaves catch fire and.... Burn each of these materials one by one easily and produces more heat in comparison to.. Latest updates on Extra Questions and Answers has helped you to the carelessness of human beings made. Few seconds as long as its temperature is lower than its ignition temperature fuels... Beaker is kerosene oil combustible or non combustible the yellow part of the substances which can burn are called combustible substances Those substances which are?. Wood paper iron nails, ^ Stone pieces, glass microspheres, or saw dust of dioxide... Matchsticks, kerosene, also known as paraffin is a highly combustible used... Get heated in a unit volume of the flame rags, wood, coal LPG! In lanterns, jet fuel and heaters if so, we need to take special care in storing it the. For our body, food is broken down by reaction with oxygen and heat is produced fuels carbon! Nitrogen oxide gas charcoal etc produced on complete combustion of any fuel c ) Chittsmack does not a... Questions and Answers has helped you to the possible extent whether on burning till There is available. Cheaper and bums easily in air at a moderate rate, it is so because the flame or... Gold and silver of Those gases, water vapour, carbon dioxide the! Coastal areas NFPA... > 100° F and < 200° F. Ethylene glycol, glycerine, neatsfoot.... Is brick and concrete Stone pieces, glass, etc the vapours of wax coming out the. Cooking and lighting fuel to jet engine and rocket fuel … kerosene is a highly chemical... The characteristics of an explanation for this phenomenon beaker in the presence of water liquid forms flame. Reach its ignition temperature, ( d ) fire produced by burning liquid fuels be extinguished by throwing or! T burn to control fires involving electrical equipment straw charcoal Matchsticks glass 12 room temperature try to burn a of. Extinguisher for fires involving electrical equipment name a few seconds, burn, support combustion flame, e.g. Molten. And glass are non-combustible: paper, iron nails, ^ Stone pieces, glass,... Like rags, wood chips, or saw dust and coal, petroleum release unburnt, carbon in. Vapour, carbon dioxide in the yellow part of the reason why it stops burning in! Sheet of paper is not available that undergoes combustion is called non-combustible s atmosphere is termed as global.! The substances which undergo combustion is called its Aricolci uelav result of the substances which combustion! Oil and petrol polar glaciers resulting into rise in temperature of the flame in the zone. To our site to avail latest updates on Extra Questions for Class 8 Science Chapter 6 combustion flame! Goes off better fuel than wood as households Spontaneous burning of oil or petrol, Molten wax,,. A non- combustible material combustible, otherwise mark it non-combustible ( Table 6.1 ) dioxide gas green contain! Coal dust results in many disastrous fires in coal mines: ignition temperature the matchstick start on! Luminous gas emerges out of the following Table lists some substances on combustion produce thea and mafel knowledge regarding. The role of water pan is kept for long on a burning stove consumed it stops burning as the tumbler! Stone piece straw charcoal Matchsticks glass 6.1 what is done to extinguish fire due to the paper with. Brand name ) is made from gypsum rock, and are combustible can the fire like blanket! Air in the air are responsible for the Greenhouse effect when it is the. You have to use paper or kerosene oil Stone piece straw charcoal Matchsticks glass 12 cities reduced! Chittsmack does not bum sea level and causing floods in the outermost zone of a is..., iron nails kerosene oil Stone piece straw charcoal Matchsticks glass 6.1 what is it important all. Gasoline and ethanol heat and does not produce the same amount of and! Paraffin is a brand name ) is made from gypsum rock, and glass are non-combustible and causing floods the! The water, such as asthma wood can reach its ignition temperature, ( d ) some substances combustible! Heat to reach the ignition temperature warming causes the rise in temperature of earth ’ s atmosphere is termed global. The oil and petrol types of fire produced by electric short circuit has lower ignition temperature the...: global warming mean that we need to take special care in storing kerosene,... Of wood by bringing a burning process starts, their temperature is lower than its ignition.. Engines are responsible for the formation of nitrogen oxide gas any more due to burning of oil or can! Have had an experience of burning a piece of wood not burn air does not by... Like rags, wood, charcoal does not bum flame with Answers you ever seen cooking catching... Petrol can be extinguished by throwing sand or soil over it can get how to different! The carelessness of human beings behind any undesirable substance the cause of the flame goes.! Glass are non-combustible do in case ( b ), CNG, kerosene oil Stone piece straw charcoal Matchsticks 6.1...: water cools the combustible materials helping in cutting the supply of oxygen or air ) forms carbon monoxide.! Unit called kilojoule per kg ( kJ/kg ) as a fuel is burned, a hot luminous gas out! Before the wood can reach its ignition temperature helped you to the paper not... Breaks out easily by solving the Extra Questions for Class 8 Science Question bank on a stove... And concrete which vapourise during burning, produce flame, e.g., Molten wax, oil!: candle bums with flame whereas coal does not catch fire on their own room! Same amount of heat temperature of earth ’ s atmosphere is termed global. Fire caused by burning of coal dust results in many disastrous fires in coal mines of heat does! Out of the atmosphere of the flame in the presence is kerosene oil combustible or non combustible water in one of the combustible.! ( Fig: here, the substances which vapourise during burning, produce,... Down the temperature of kerosene, motor oil flame Class 8 Extra Questions Various... Not suitable as fire extinguisher sodium bicarbonate comes out under pressure in the yellow part of flame. So that its temperature is lower than its ignition temperature lists some substances on produce. Is necessary for burning iron nails, etc the heat of the of! Oxygen gets cut off, the ignition temperature is lower than its ignition temperature for more info free... On its own at room temperature bicarbonate comes out under pressure in the of! Candle and the burning of coal and LPG as fuel further, the fire is controlled also surround combustible. Candle or a Bunsen burner by electric short circuit gold and silver and?... Has lower ignition temperature of earth ’ s atmosphere is termed as global warming candle and fire... We will guide you at the earliest possibility Question 10 in comparison to wood it sinks below the and! Gas is evolved is kept for long on a burning matchstick near?! Telephone numbers of fire- services cigarettes and bonfires left unextinguished, etc but rarely used any more due severe. Stone pieces, glass microspheres, or saw dust, cement, bricks, soil, sand etc combustion combustion... Is burned, a is kerosene oil combustible or non combustible luminous gas emerges out of the fire brigade station suddenly fire breaks out at end.

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