Question

with rise of temperature air become light, why?​

Answer 1

$\huge\tt{Answer:-}$

Hot Air. Air is made up of molecules that are constantly in motion. As air warms up, the molecules start to vibrate and bump into each other, increasing the space around each molecule. Because each molecule uses more space for motion, the air expands and becomes less dense (lighter).

Answer 2

Explanation:

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Hot Air. ... As air warms up, the molecules start to vibrate and bump into each other, increasing the space around each molecule. Because each molecule uses more space for motion, the air expands and becomes less dense (lighter).