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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?

Qmechanic
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adi_chem
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1 Answers1

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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.