# Thought of the day_17_ Temperature and Frames

Is temperature a frame dependent quantity?

State your answer as per classical point of view as well as relativistic point of view.

Note by Rohit Gupta
3 years, 1 month ago

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I think this is a loaded question, because it depends on how the measurement of temperature is made. One way to measure temperature "remotely" is to use blackbody radiation frequency (which is how we measure how hot stars are). Well, in both classical and relativistic cases, there is a Doppler shift caused by relative motion, so temperature would be a "frame dependent quantity".

To go beyond this, we need better definition or requirements for "making a measurement of temperature". Use a mercury bulb thermometer?

- 3 years, 1 month ago