thermal emissivity
[/ˈθɜːrməl ɪˈmɪsɪvɪti/]
nounfeminine
emissividade térmica
1. The ratio of thermal radiation emitted by a material to the thermal radiation emitted by an ideal black body at the same temperature; a measure of how effectively a surface emits thermal energy
The thermal emissivity of aluminum is lower than that of black paint, making it a better reflector of heat.
A emissividade térmica do alumínio é menor do que a da tinta preta, tornando-o um melhor refletor de calor.
2. In physics and engineering, a dimensionless quantity ranging from 0 to 1 that describes the effectiveness of a material as a thermal radiator
Engineers calculated the thermal emissivity of the spacecraft's exterior coating to ensure proper heat dissipation.
Os engenheiros calcularam a emissividade térmica do revestimento exterior da espaçonave para garantir a dissipação adequada de calor.
This is a technical term primarily used in physics, engineering, and materials science. In Brazil, it is commonly encountered in academic curricula, industrial applications (particularly in aerospace and automotive sectors), and STEM research. The term is standardized across both Brazilian Portuguese and European Portuguese scientific communities.
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