This question has been closed: How was mass increase measured? because:

I’m voting to close this question because it concerns the history of physics – Bob D

and then:

Closed. This question is off-topic. It is not currently accepting answers.

I have been around for a few years and have never heard anything so weird.

There are loads of questions bordering history, but mine does not:

And many more concerning past experiments:

As I clearly explained, the question was absolutely legitimate, since in 1894 the mass spectrometer was not yet available and Thomson had not even discovered the electron. Is that really off-topic?


1 Answer 1


Our policy on historical questions is here - just being about history does not make a question off-topic.

However, not being about physics as a natural science does. Apart from asking three different questions and hence being too broad (please only ask a single question per post, unless they are so closely related they cannot be meaningfully answered in separation!), your second question "why Einstein is credited with the formula, when since 1900 the equivalence had been found (/ proved?) by WIEN?" is more about sociology and the dynamics of how attributing credit works than physics as a natural science, and hence off-topic here.


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