emissivity


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em·is·siv·i·ty

 (ĕm′ĭ-sĭv′ĭ-tē)
n.
The ratio of the radiation emitted by a surface to the radiation emitted by a blackbody at the same temperature.

emissivity

(ɪmɪˈsɪvɪtɪ; ˌɛm-)
n
(General Physics) a measure of the ability of a surface to radiate energy; the ratio of the radiant flux emitted per unit area to that emitted by a black body at the same temperature. Symbol: ε

em•is•siv•i•ty

(ˌɛm əˈsɪv ɪ ti, ˈi mə-)

n.
the ability of a surface to emit radiant energy compared to that of a black body at the same temperature and with the same area.
[1875–80]
Translations
References in periodicals archive ?
22-23], they are never made from materials whose emissivity is strongly directional.
057 emissivity on surface 2 on the inside surface of the exterior lite of glass, and hard-coat (pyrolytic) low-e coating with 0.
Typically, construction materials present low reflectivity and emissivity values, which make them absorb a considerable amount of heat from the sun.
Where h is the convective heat transfer coefficient, A is the surface area of the object, [epsilon] is the emissivity, [sigma] is the StefanBoltzmann constant, T is the steady-state temperature of the object, [T.
Microwave radiometers on satellites pick up these differences in emissivity, which are observed as variations in brightness temperature for the different types of ice.
Taking into consideration the advantages of low emissivity glasses in decreasing the energy consumption, the technical certificate of such glasses has recently been extended by Building and Housing Research Institute.
The coating line will be up and running from October 2012 and will produce high performance, low emissivity glazing products to complement Pilkington's renowned K Glass, as well as its solar control glass products.
The coating line will be operational from October, 2012, and will provide customers with high performance, low emissivity glazing products, complementing Pilkington's well-established K Glass, as well as solar control glass products.
The coating is called Low-E coating, or low thermal emissivity coating.
b] of the park (obtained in some normalized conditions), then R can be interpreted as the emissivity of the roadway segment itself, since the total emission will change according to the particular ambit and driving conditions given by the segment.
alb]), solar zenith angle ([theta]), longwave emissivity ([epsilon]), and Earth emitted radiation (E").
s] is given by multiplying the Planck function by spectral emissivity [epsilon]([lambda]) (Zhengming, 1999).