the answer you really want is here Tudds.

The reason why hot objects are heavier is because E=mc2. If you have absolutely identical objects that have the same weight exactly when they are at same temperature, then when one object is heated, it will weigh more. This is because the gravitational force depends on the stress energy tensor in general relativity.

Posted By: shoddy on May 16th 2018 at 17:39:57


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