ArXiv.org e-Print archive. La sélection du Passeur no 4. Heat index. The heat index (HI) or humiture or humidex (not to be confused with the Canadian 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 32 °C (90 °F) with very high humidity, the heat index can be about 41 °C (106 °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. History[edit] In Canada, the similar humidex is used in place of the heat index.
Meteorological considerations[edit] This table is from the U.S. Motion Induced Blindness. Www.ostralo.net. Animations - Simulations. Vidéo Expériences. Universcience.tv la Web TV scientifique hebdo numéro 62. Curiosphere.tv - Vidéos et ressources éducatives pour primaire, collège et lycée.