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Humidity

Why the densi...

Question

Why the density of air decreases with increase in humidity?

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Solution

when water molecules (water vapor) are added to a given volume of air, the dry air molecules must decrease by the same number, to keep the pressure or temperature from increasing. Hence the mass per unit volume of the gas (its density) decreases.

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Q. Sound travels faster in rarer medium but Why density of air decreases with increasing humidity or moisture and is said that density of humid air is 5\8 th times density of normal air? Should not density of air increase with more water vapour ?

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