[eli5] Why temperature is not relative if velocity is relative

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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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Anonymous 0 Comments

> Is it possible that some observers will find a hot object cold?

No, because the hot object has particles moving randomly in many different directions at any one time. You could match the speed of some particles but that would mean all the others were moving faster and the average speed, which is what gives temperature, wouldn’t change, if anything increasing slightly.

By moving very fast relative to gases it can seem as if their temperature increases. Given that air molecules are moving roughly 1000 mph, you have to be going very fast to feel this effect; we’re talking about jet aircraft and rockets.

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