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  #21  
Old February 3rd, 2015, 12:20 PM
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Emissivity and absorptivity
Main article: Kirchoff's law of thermal radiation
There is a fundamental relationship (Gustav Kirchhoff's 1859 law of thermal radiation) that equates the emissivity of a surface with its absorption of incident light (the "absorptivity" of a surface). Kirchhoff's Law explains why emissivities cannot exceed 1, since the largest absorptivity - corresponding to complete absorption of all incident light by a truly black object - is also 1
Source:
http://en.wikipedia.org/wiki/Emissivity

Now look up your surface here

http://www.engineeringtoolbox.com/em...nts-d_447.html
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  #22  
Old February 3rd, 2015, 03:06 PM
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Quote:
Originally Posted by rover4x4 View Post
What you recon it is at the back of the block
Slightly less temp but not much.
I tapped into my heater hose(the hot supply) and ran an extra guage per a Pirate4x4 writeup years ago.

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