Question
Give scientific reasons : Burning substances (fuels) burn with or without a flame.
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Answer
- When the gaseous substances are heated, a luminous flame is seen and they start to glow.
- Some liquid and solid fuels burn with a flame because on heating, their atoms easily get converted into vapours; and burn with a luminous flame starting with glow.
- When volatile substances present in this type of fuel vapourises, then the fuel just glows red and gives out heat without flame.
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