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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No, because it doesn’t work like that.
Relativistic effects are seen between objects moving at a high relative velocity, such as a distant galaxy retreating from Earth.
The molecules of a substance move in all different directions, and the temperature of that substance is the *average* kinetic energy of the molecules. (They also aren’t moving anywhere near light speed. Air molecules in a room at room temperature move at about 300 to 400 metres per second.) So the temperature of the object is, to all intents and purposes, identical to any observer.
How it *feels* to different observers depends not only on temperature but various physiological factors, so what is warm to one person may be cold to another. But this isn’t because of the relative motions of the molecules of the substance.
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