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R almost exclusively stands for radius, like in math. However, it depends on the situation. For example, in the equation PV=nRT, R is actually the gas constant, which is 8.31 J/(mol*K). I recommend looking at the units, as that will almost always show what 'R' should represent; anything in a single dimension (ie meters, parsecs, kilometers) R is most likely radius.

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Q: What does r stand for in Physics?
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