Suppose Ryan presses the liquid in flask with piston inside a accelerating lift with acceleration $t$. He presses it with force $F$ on area $A$ assume mass of fluid be $M$.

So from lift frame forces on liquid are F and Mt.So net pressure should be (F+Mt)/A.

But from ground frame pressure will be F/A.

So is PRESSURE frame dependent?

  • $\begingroup$ How did you reach the expression you say is valid in an accelerated frame? It is wrong $\endgroup$
    – user65081
    Commented Jan 25, 2021 at 11:22
  • 1
    $\begingroup$ The person from ground missed to consider the pseudo force $\endgroup$
    – Jdeep
    Commented Jan 25, 2021 at 11:40
  • $\begingroup$ i might have messed up with frames pl correct it $\endgroup$
    – Ha'Penny
    Commented Jan 26, 2021 at 7:05

1 Answer 1


Sorry but force is frame independent. So pressure is frame independent.


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