Question

light travels faster in hot air or in cold air​

Answer 1

So light actually slows down more in dense air, not necessarily cold air. ... But hot air can maintain the same pressure as cold air at lower density. This is because pressure is the effect of molecules bouncing at high speed. In hot air, the molecules are going faster, so we need less of them to create the same pressure.

Answer 2

$\huge\bold{QUESTION}$

Light travels faster in hot air or in cold air?

$\huge\underline{\mathcal{ANSWER}}$

Hot Air

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