So, we all know whether a train is moving depends on where the observer is. For passengers riding on it, the train is not moving. And high temperature are just particle moving with high speed. Is it possible that some observers will find a hot object cold? Just like the passengers on the train Thanks in advance!
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Temperature is relative. But the temperature of a thing is based on its average temperature and normal things contain so many atoms and molecules moving in all directions so that the temperature of the thing is not relative.
And there is a relativistic effect, it is just so small as to be insignificant.
So for practical purposes the temperature is not relative, but technically it is.
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