Moisture

The humidity is a parameter used to measure the amount of water vapor contained within an air mass.
It can make a distinction between relative and absolute humidity.

L’umidità assoluta è la quantità di vapore acqueo espressa in grammi che è contenuta in un metro cubo di aria ad una certa temperatura e pressione. The absolute humidity tends to increase as the temperature rises.

Much used (for practical reasons) è lumidità relativa che esprime, percentage, the ratio between the quantity of water vapor contained in an air mass and the maximum amount that may contain the same under the same temperature and pressure conditions. The relative humidity therefore provides information on how an air mass is far from the saturation condition.

As the capacity of air to hold water vapor increases with temperature, ne can che, leaving unchanged the amount of water vapor contained in a certain volume of air and the pressure, l’umidità relativa diminuisce all’aumentare della temperatura e viceversa. This is because as the temperature increases is required a greater amount of water vapor to reach saturation.

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