- the ability of a surface to emit radiant energy compared to that of a black body at the same temperature and with the same area.
Origin of emissivity
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for emissivity
The emissivity increases with the temperature, else no state of thermal equilibrium could be reached.
- a measure of the ability of a surface to radiate energy; the ratio of the radiant flux emitted per unit area to that emitted by a black body at the same temperatureSymbol: ε