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Sound waves travel faster in humid air because humidity would decrease the density of the air. As density decreases then speed of sound would increase as speed is given as c = ./ P/d

./ is the square root symbol. d is the density and P the pressure. Pressure change wont change the speed of sound since P/d remains constant.

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11y ago
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Q: Do sound waves travel faster in dry air or in humid air?
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