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I know that the pressure and temperature follows stagnation relations of pressure and temperature as well as area mach relation inside a convergent nozzle along the length. And according to that equation, it forms a curve that represents the pressure anf temperature. But I want to know why it is happening? Why pressure and temperature decreases along convergent nozzle? Like what physics it follows? What theory it follows? What law? According to what effect this is happening?

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