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Questions tagged [astrophysics]

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Earliest use of the word 'polytropic' to describe an equation of state or process

When and by whom was the word 'polytropic' first used to describe an equation of state or process of the form $P \propto V^n$? Why was this particular word chosen? The earliest use of the word that I ...
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When did the research field of Astrophysics begin?

I have this vague idea that Astrophysics morphed out of Astronomy as a field of study and research. I am curious if this is true and when did Astrophysics become separate from Astronomy as a field of ...