Definitions for heat index
heat in·dex

WiktionaryRate this definition:0.0 / 0 votes

1. heat indexnoun

   A figure used by American meteorologists to describe the apparent heat felt by a person as the result of a combination of temperature and humidity.

2. Etymology: From heat + index

WikipediaRate this definition:0.0 / 0 votes

1. Heat index

   The heat index (HI) is an index that combines air temperature and relative humidity, in shaded areas, to posit a 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", "apparent temperature", "real feel" or "feels like". For example, when the temperature is 32 °C (90 °F) with 70% relative humidity, the heat index is 41 °C (106 °F). The humidity where the heat index feels like itself is typically left unstated. The heat index example in this case, 41°C, feels like 41°C only when the humidity is 21%. The human body normally cools itself by perspiration, or sweating. Heat is removed from the body by evaporation of that sweat. However, high relative humidity reduces the evaporation rate. This results in a lower rate of heat removal from the body, hence the sensation of being overheated. This effect is subjective, with different individuals perceiving heat differently for various reasons (such as differences in body shape, metabolic differences, differences in hydration, pregnancy, menopause, effects of drugs or drug withdrawal); its measurement has been based on subjective descriptions of how hot subjects feel for a given temperature and humidity. This results in a heat index that relates one combination of temperature and humidity to another. Because the heat index is based on temperatures in the shade, while people often move across sunny areas, the heat index can give a much lower temperature than actual conditions of typical outdoor activities. Also, for people exercising or active, at the time, then the heat index could give a temperature lower than the felt conditions.

WikidataRate this definition:0.0 / 0 votes

1. Heat index

   The heat index or humiture or humidex is an index that combines air temperature and relative humidity in an attempt to determine the human-perceived equivalent temperature — how hot it feels. The result is also known as the "felt air temperature" or "apparent temperature". For example, when the temperature is 90 °F with very high humidity, the heat index can be about 105 °F. The human body normally cools itself by perspiration, or sweating. Heat is removed from the body by evaporation of that sweat. However, relative humidity reduces the evaporation rate because the higher vapor content of the surrounding air does not allow the maximum amount of evaporation from the body to occur. This results in a lower rate of heat removal from the body, hence the sensation of being overheated. This effect is subjective; its measurement has been based on subjective descriptions of how hot subjects feel for a given temperature and humidity. This results in a heat index that relates one combination of temperature and humidity to another one at higher temperature and lower humidity.

How to pronounce heat index?

1. Alex

   US English

   David

   US English

   Mark

   US English

   Daniel

   British

   Libby

   British

   Mia

   British

   Karen

   Australian

   Hayley

   Australian

   Natasha

   Australian

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   Indian

   Priya

   Indian

   Neerja

   Indian

   Zira

   US English

   Oliver

   British

   Wendy

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   South African

How to say heat index in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of heat index in Chaldean Numerology is: 8

2. Pythagorean Numerology

   The numerical value of heat index in Pythagorean Numerology is: 9

Examples of heat index in a Sentence

1. Robert Glatter:

   But they are at risk as well when the heat index rises. Keeping ahead of their thirst is the key, not just drinking when they feel thirsty, taking breaks is essential when intensely exercising in the heat for more than one hour. This includes rest, finding shade from the sun, and drinking water mixed with sugar and electrolytes. Salty pretzels, fruit and nuts are always a good option if you don't have access to a drink with sugar and electrolytes.

References

1. ^ Wiktionary
   https://en.wiktionary.org/wiki/Heat_Index
2. ^ Wikipedia
   https://en.wikipedia.org/wiki/Heat_Index
3. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=heat index