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heat index

noun
1.
a number representing the effect of temperature and humidity on humans by combining the two variables into an “apparent” temperature, introduced as a replacement for the temperature-humidity index: a temperature of 90° and relative humidity of 65 percent combine to produce a heat index of 102.
Abbreviation: H.I.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for heat index
  • The weather both years was the same as was the heat index and rain fall.
  • These daily mean, minimum, and maximum heat index products are guidance products.
  • These workers are at risk of heat-related illness when the heat index is high.
  • These must be taken into consideration even when the heat index is lower.
  • The heat index combines the effects of heat and humidity to arrive at an apparent temperature.
  • Get the heat index for your work site and precautions to prevent heat illness.
  • For the same given temperature, more humid conditions will result in a higher heat index value.
  • When no stations meet this criteria the heat index option will be disabled.
heat index in Science
heat index  
A measurement of the air temperature in relation to the relative humidity, used as an indicator of discomfort. The heat index is higher when high air temperatures occur with high humidity, and lower when they occur with low humidity. The heat index is based on studies of skin cooling caused by the evaporation of sweat. Also called apparent temperature.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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