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General Physics

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28 Jan 2012 19:50:33 IST

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kindly explain me the following terms:

Physics

kindly explain me the following terms:

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manikaran

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Joined: 19 Dec 2011

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28 Jan 2012 19:51:10 IST

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emmittanceemmissivity?????????????

manikaran

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Joined: 19 Dec 2011

Posts: 12

28 Jan 2012 19:51:12 IST

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emmittanceemmissivity?????????????

manikaran

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28 Jan 2012 19:51:31 IST

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emmittance amd emmissivity?

Bipin Dubey

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Joined: 23 Jan 2007

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29 Jan 2012 13:04:15 IST

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Emissivity, or "emissive power" [E(b)], is the rate at which radiant energy is given off by a body per unit area per unit time (often in W/m^2). Emittance (epsilon), on the other hand. is a dimensionless ratio ? the ratio E:E(b) ? that is, the ratio of the emissivity of a body to the emissivity of a perfectly-emitting and absorbing (theoritical) black body. Thus, emittances are always less than 1.0

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