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Why does warm air rise during convection?

Answer 1

Why does wood float on water?

Wood floats because it is less dense than water and displaces a volume of water that is heavier than the mass of the wood.

Convection happens when warm air or warm gas rises above cold air because it is less dense than cold gas, gets cooler as it does so, and there is net movement between the warmer gas below and the colder temperature gas above.

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Answer 2

Jose Ayala

As warm air heats up, its molecules gain energy and begin to move faster and spread out, decreasing the air's density. Because less dense air rises above denser air, warm air moves upward and convection currents are created. Warm air rises during convection because it becomes less dense than the surrounding cooler air.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.