Pascal's law states that pressure is transmitted undiminished in an enclosed static fluid. Is this law applicable, say, We apply it to a small scale so molecules push each other to transmit the pressure to the whole fluid say water so what about in a very large enclosed ocean could molecules push all the way? and what is the percentage of the lost pressure?

  • $\begingroup$ Yes..any enclosed fluid. $\endgroup$ Oct 23, 2015 at 16:27
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    $\begingroup$ For an ocean, it's going to be hard to reach the limit of a "static fluid". $\endgroup$
    – BowlOfRed
    Oct 23, 2015 at 16:56
  • $\begingroup$ @BowlOfRed What's the limit of static fluid? $\endgroup$ Oct 23, 2015 at 17:36
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    $\begingroup$ It means that the law is only valid when the fluid is stationary. The closer you get to it, the less the deviation from the ideal. A large body like an ocean will have currents and waves. These will cause significant pressure deviations from what you might expect if you assumed a static fluid. $\endgroup$
    – BowlOfRed
    Oct 23, 2015 at 17:39
  • $\begingroup$ @BowlOfRed I'm just assuming that we have an imaginary situation of an enclosed ocean so no waves are there and it's static like a very huge hydraulic press $\endgroup$ Oct 23, 2015 at 17:42

1 Answer 1


Yes, it works fine.

Pressure loss is generally associated with restrictions to flow. But when there is no flow, no such loss occurs.

Assume you are in the (again, static) ocean at a particular depth. If there were more pressure from one side than the other, then the pressure difference would accelerate some of the fluid and cause flow. The redistribution would decrease the pressure difference. Once the fluid stopped moving, the pressure would once again be identical.

In a huge fluid, this redistribution will take much longer than in a small tank. But given sufficient time and stability, it would happen.


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