Question

physical property used to express the amount of water vapaor present in air

Answer 1

On this basis, 21% of the total volume of dry air is oxygen and around 1% is typically argon. The air temperature dictates the maximum partial water vapour pressure in air, in other words, the water vapour saturation pressure. The ability of water to be gaseous form is strongly dependent on its temperature.

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Answer 2

Humidity is the water vapor content per cubic cm of air and measured as the percentage in air