单词	emissivity
释义	emissivity noun emis·​siv·​i·​ty ˌe-mə-ˈsi-və-tē  ˌē-ˌmi-ˈsi- plural emissivities : the relative power of a surface to emit heat by radiation : the ratio of the radiant energy emitted by a surface to that emitted by a blackbody at the same temperature Example Sentences Recent Examples on the Web Many energy-efficient windows, for example, are glazed with a low-emissivity (low-E) coating. Maria Masters, Better Homes & Gardens, 10 Jan. 2022 Look for windows labeled low-emissivity (low-E) or spectrally selective. Kaylei Fear, Better Homes & Gardens, 15 Mar. 2022 Energy-efficient windows have an insulating glass unit, Low-E (low-emissivity) coatings, gas fill, and other engineering advancements that stop heat transfer. Debbie Wolfe, Better Homes & Gardens, 18 Jan. 2022 For example, a low-emissivity (low-e) coating can reduce energy loss by as much as 30% to 50%. Maria Masters, Better Homes & Gardens, 15 June 2021 The amount of thermal radiation depends on the emissivity of the object. Chris Lee, Ars Technica, 17 July 2019 The emissivity of an object can have a value between 0 and 1. Rhett Allain, WIRED, 9 July 2019 In the world of infrared cameras, different materials can have a different emissivity. Rhett Allain, WIRED, 9 July 2019 The emissivity is a number between one and zero that depends on the physical properties of the object. Chris Lee, Ars Technica, 17 July 2019 See More Word History First Known Use 1880, in the meaning defined above Medical Definition emissivity noun emis·​siv·​i·​ty ˌem-ə-ˈsiv-ət-ē  ˌē-ˌmis-ˈiv-  plural emissivities : the relative power of a surface to emit heat by radiation : the ratio of the radiant energy emitted by a surface to that emitted by a blackbody at the same temperature
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