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emissivity
This term is a specialized technical parameter used primarily in thermodynamics and heat transfer physics. It describes a ratio between 0 and 1, where a value of 1 represents an ideal black body that absorbs and emits all radiation perfectly. In practical engineering, it is used to calculate how much thermal radiation a surface actually releases compared to a theoretical maximum.
Because it represents a specific physical property or a dimensionless coefficient, the word is treated as an uncountable noun. It refers to the quality of the material rather than a discrete object that can be counted.
Meanings
Examples
The emissivity of a polished silver surface is very low.
We need to adjust the emissivity setting on the infrared thermometer for an accurate reading.
Does this material have a high emissivity at room temperature?
The researcher noted that the emissivity varies depending on the wavelength of the radiation.
The researcher noted that the emissivity varies depending on the wavelength of the radiation.
I wonder if the emissivity of the coating will degrade over time due to oxidation.
A perfect black body has an emissivity of exactly one.
Check the emissivity value in the material handbook before starting the simulation.
The heat shield was designed with low emissivity to minimize thermal radiation.