emissivities
/ˌɛmɪˈsɪvɪtiz/
noun
- The plural of emissivity; the measure of how well a surface gives off thermal radiation compared to a perfect blackbody.
- Engineers measure the emissivities of surfaces to design better heating systems.
- Different materials have different emissivities, which affect how they cool down.
- The emissivities of metals are usually lower than those of non-metals.