I read in the textbook which says that, according to the usual definition the absolute value of ##n^\mu T_{\mu\nu}## is just the pressure. ##T_{\mu\nu}## is the energy-momentum tensor and ##n^\mu## is a four dimensional normal vector.(adsbygoogle = window.adsbygoogle || []).push({});

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# Why ##n^\mu T_{\mu\nu}## is called the pressure?

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