Humidity is the amount of
water vapor in a sample of
air compared to the
maximum amount of water vapor the air can hold at any specific
temperature. Absolute humidity,
relative humidity and specific humidity are different ways to express the water content in a parcel of air. Relative humidity is the most frequently used of these expressions because of its importance in
weather forecasting. Relative humidity indicates the likelihood of
precipitation,
dew, or
fog. High relative humidity makes people feel hotter outside in the summer because it reduces the effectiveness of
sweating to cool the body by preventing the
evaporation of perspiration from the skin. This effect is calculated in a
heat index table. Warm water vapor has more
thermal energy than cool water vapor and therefore more of it evaporates into warm air than into cold air.
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