Sentences with phrase «high emissivity»
"High emissivity" refers to a surface or material's ability to easily emit or release heat or infrared radiation. In simple terms, it means that the object can quickly and efficiently give off heat or energy. Full definition
Ceramic has a very high emissivity rating, meaning it produces a lot of infrared heat.
infraredsauna.com
So the atmosphere is heated by IR from the sun and by convection of heated air (taking H2O with it, and some CO2 with that) from below and by OLR from surfaces with higher emissivities, topped by asphalt near 99 %.
The high emissivity of CO2 in the IR actually contributes to our radiative equilibrium temperature being another 20K or more lower than that but I'll wait until somebody is interested in implementing the computations in CoSy or puts a table, not a graph, of an actual measured mean spectrum in my lap.
Glass has a high emissivity.
The atmosphere is really part of the active cooling system of the planet, and increasing CO2 increases the rate of cooling because the sun - heated atmosphere is hotter than the bulk of space and the higher emissivity of the CO2 helps cool the atmosphere.
In the microwave part of the electromagnetic spectrum (at 16 mm wavelength, to be exact), ice has a high emissivity (0.8 to 0.97) whereas the emissivity of liquid water is much lower (0.44).
The idea of spraying aluminum into our atmosphere goes way back, patents exist that clearly demonstrate the consideration of such materials that include the oxides of metals which have high emissivity.