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.
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.
- Heating element
noun 1. a coil or other arrangement of wire in which heat is produced by an electric current
heat-labile adj. Destroyed or altered by heat.
- Heat of formation
noun 1. (chem) the heat evolved or absorbed when one mole of a compound is formed from its constituent atoms
noun, Physics. 1. the heat absorbed by a unit mass of a given solid at its melting point that completely converts the solid to a liquid at the same temperature: equal to the heat of solidification. heat of fusion The amount of heat required to convert a solid at its melting point into a liquid […]
- Heat of reaction
noun 1. (chem) the heat evolved or absorbed when one mole of a product is formed at constant pressure