1. The calorific value of a fuel is expressed in a unit called kilojoule per kg (kJ/kg). https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-6/

    The calorific value of a fuel is expressed in a unit called kilojoule per kg (kJ/kg).

    https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-6/

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  2. Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not because the ignition temperature of paper is low as compare to the paper wrapped around an aluminium pipe. https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-6/

    Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not because the ignition temperature of paper is low as compare to the paper wrapped around an aluminium pipe.

    https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-6/

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  3. LPG is a good fuel as compared to wood as it readily available and it is cheap. It burns easily in air at a moderate rate and it produces a large amount of heat. It does not leave behind any undesirable substances. https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-6/

    LPG is a good fuel as compared to wood as it readily available and it is cheap. It burns easily in air at a moderate rate and it produces a large amount of heat. It does not leave behind any undesirable substances.

    https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-6/

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  4. Water is not used to control fires involving electrical equipment because it may conduct electricity and harm those trying to douse the fire. https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-6/

    Water is not used to control fires involving electrical equipment because it may conduct electricity and harm those trying to douse the fire.

    https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-6/

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  5. CNG produces very small amounts of harmful products like Sulphur dioxide, oxides of nitrogen, oxides of sulphur etc. CNG is a cleaner fuel. https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-6/

    CNG produces very small amounts of harmful products like Sulphur dioxide, oxides of nitrogen, oxides of sulphur etc. CNG is a cleaner fuel.

    https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-6/

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