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Q.

What is relative humidity?How is it measured....

Tags: food, science, environment
Asked by Annie, 26 Sep '13 06:21 pm
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1.

The relative humidity left(phiright) of an air-water mixture is defined as the ratio of the partial pressure of water vapor (H2O) left({e_w}right) in the mixture to the saturated vapor pressure of water left({{e^*}_w}right) at a given temperature.
Relative humidity is normally expressed as a percentage and is calculated by using the following equation:[1]
phi = {{e_w} over {{e^*}_w}} times 100%
he humidity of an air-water vapor mixture is determined through the use of psychrometric charts if both the dry bulb temperature (T) and the wet bulb temperature (Tw) of the mixture are known. These quantities are readily estimated by using a sling psychrometer.
There are several empirical correlations that can be used to estimate the saturated vapor pressure of water vapor as a function of temperature. The Antoine equation is among the least complex of these formulas, having only three parameters (A, B, and C). Other correlations, such as those presented by Goff-Gratch and Magnus ...more
Source: My intelligent mind!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answered by preetibarna panda, 26 Sep '13 06:27 pm

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2.

Relative humidity expresses how much of the energy available for evaporation has been used to "free" liquid water molecules from hteir neighbors. A relative humidity of 50% means half the available energy has been used to evaporate water from the ground, streams, lakes anywhere else it is and 50% is still available to do more evaporation.
Answered by anil garg, 26 Sep '13 10:57 pm

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3.

It's humidity at relative's house.. justt call them and ask about it.

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