what is the temperature of Vacuum since temperature of a system is related to the average of the molecular kinetic energy and there is no molecule in a vacuum? i know there could be radiations but i want to know how much the contribution is?
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The temperature of the vacuum is usually defined as the temperature of the thermal radiation in it. If the spectrum doesn't follow the Planck curve reasonably well, then it's meaningless to speak of temperature of the vacuum. A monochromatic light source, for instance, doesn't have a temperature. – CuriousOne Jan 01 '16 at 15:29
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7Possible duplicate of Temperature in space – John Rennie Jan 01 '16 at 15:33
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Probably related as well: http://physics.stackexchange.com/q/2059/ – Kyle Kanos Jan 01 '16 at 21:02
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If you stick a thermometer in a vacuum it will eventually read the same temperature as the container of said vacuum. If it is in deep space it will eventually read as the background temperature of the universe which is about 2.7K.
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No. The measured temperature is always that of the container. The only exception would be an accelerating reference frame seeing Unruh radiation https://en.wikipedia.org/wiki/Unruh_effect – Jan 01 '16 at 20:58