Why is warm air lighter than cold air?

Due to heating, the pressure of air increases and air with higher pressure is lighter than air with lower pressure.

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Due to heating, the pressure of air decreases and air with lower pressure is lighter than air with higher pressure.

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Due to heating, air expands. When same mass occupies more volume it becomes lighter.

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Due to heating, air contracts. When same mass occupies less volume it becomes lighter.

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Solution

The correct option is C Due to heating, air expands. When same mass occupies more volume it becomes lighter.
Warm air is lighter than cold air because on heating the air expands and occupies more space. When the same thing occupies more space, it becomes lighter and is lesser. The warm air rises up since it is lighter. The less denser air floats in the much denser air just like ice floats on water as ice is is less dense than water.

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