According to special relativity mass doesnt add up like we think it does. That is, a system of 2 protons might not necessarily have a system mass of 2*(mass of one proton). If the protons are travelling their system mass can be more than the sum of individual masses.
I understand this in theory completely. But I'm looking for an experiment that has actually weighed two protons in motion and found the weight to be different. (need not be just protons or any other tiny particle)
I have heard about the water tumbler experiment in which someone tried to heat it up and then measure the change in weight (mass of heat) but was unsuccessful. I understand that this is not a straightforward question-answer question. But I had nowhere else to go.
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