anonymous anonymous
anonymous anonymous answered

Not all components of air support burning . Nitrogen and C02 don't support burning. O2 supports burning and that's why if you burn something in pure oxygen it burns more rapidly and brightly than if you burn it in air that contains 78% nitrogen and 2% oxygen.

anonymous anonymous
anonymous anonymous answered

When water is evaporated from waterbodies that heat up due to the sun's heat, they become water vapour. They then rise up till they reach the clouds where they cool down, condense, become water droplets and become heavy. Hot air is light so it rises but cold air is heavy so it settles on something. 

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