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In a perfect vacuum, if that were possible, what would the temperature be?

April 26, 2017Mathematics Perfect Physics possible temperature vacuum

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In a perfect vacuum, if that were possible, what would the temperature be?

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Likely any object suspended within the perfect vacuum would be at the same temperature as the walls of the container due to radiation heat transfer but the vacuum would contain no gas to support convection or conduction. In outer space the temperature would likely be the background temperature of the universe (left over from the Big Bang) again due to radiation heating, approximately 2.725K. If an object is orbiting the sun (or another star) one side would be very hot and the other very cold (like the moon).

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It could be any temperature you wanted. You could contain your perfect vacuum in a sphere of one metre diameter then either heat it or cool it and a thermometer would register the heat or lack of heat.