Our textbooks state that work done by the gas is,
dW=Pexternal dV
But why can't it be
dW=Pgas dV
Why do we consider the external pressure instead of the pressure of the gas in the container while calculating work done by an ideal gas?
What is stagnation point in fluid mechanics. At the open end of the pitot tube the velocity of the fluid becomes zero.But that should result...
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