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Radiation through a vacuum

by Brent

I began my work by finding the equation for heat lost through radiation. After some searching, I discovered that the equation was Q/t=eA(Ts^4-Tsur^4), where e is the emissivity constant of the radiating object, is the Stefan-Boltzman constant, A is the surface area, Ts is the temperature of the radiating object, and Tsur is the temperature of the surroundings. In order to find all pf these pieces of information, it is helpful to look through research papers with regard to specific substances. All of these are fairly common knowledge, except for the emissivity constant and the Stefan-Boltzman constant. Emmissivity constants can be anywhere from 1 to 0, with 1 being the value for a black body radiator, and 0 for an object that does not radiate at all. Black bodies are objects that absorb all radiation that strikes them, meaning they are perfectly black, as no light bounces off their surface. When heated to a specific temperature, black bodies also become perfect radiators. The Stefan-Boltzman constant is just a constant, equal to 5.67 X 10-8. With all of these pieces of information, you can calculate the Watts of heat lost by any object.

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