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as i heard it many times that vacuum persist temperature but i don't agree with this point
And you might want to call it 'heat', ...
..but there will be no measurable temperature unless you introduce rest mass to interact with it.
Only in relation to matter, as I think, Evan.
What do you mean by 'body' Pete?
That should mean that you need more than the random movement of one lone particle to create heat.
So it is then particles of restmass interacting with each other that creates radiation,..
If you want to consider a "perfect" vacuum, with no particles apart from your thermometer, you could put your thermometer in intergalactic space, far from any wandering planets, stars or gas clouds. In this case, the temperature of the thermometer would slowly decline until it approached around 2-3 Kelvin, which represents thermal equilibrium with the Cosmic Microwave Background Radiation.So I would have to conclude that a vacuum does have a temperature.
Beg to disagree. Intergalactic space by definition is not a vacuum because it contains galaxies.
the speed of light in free space or a vacuum