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Heat index

The heat index (HI) or humiture is an index that combines air temperature and relative humidity, in shaded areas, as an attempt to determine the human-perceived equivalent temperature, as how hot it would feel if the humidity were some other value in the shade. The result is also known as the "felt air temperature" or "apparent temperature". For example, when the temperature is 32 °C with 70% relative humidity, the heat index is 41 °C. This heat index temperature has an implied (unstated) humidity of 20%. This is the value of relative humidity for which the heat index formula indicates 41 °C feels like 41 °C. A heat index temperature of 32 °C has an implied relative humidity of 38%.

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An index that combines the air temp and R.H. to determine and apparent temp, i.e., what "feels like" to the average person.

Contributed by George U Anyiwo

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