Question

Someone claims that the absolute pressure in a liquid
of constant density doubles when the depth is doubled.
Do you agree?

Answer 1

Answer:It’s slightly incorrect (for an incompressible liquid such as water.)

The pressure of the air (above the water ads the equivalent of about 33 feet of water.

So simply doubling is ignoring this starting pressure — since the question uses “depth” we must assume it is this typical type of measurement.

There is also SOME compressibility at extremely great depths (even in water) but this is a small effect.

Explanation:

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Answer 2

Answer:

It’s slightly incorrect (for an incompressible liquid such as water.)  

The pressure of the air (above the water ads the equivalent of about 33 feet of water.  

So simply doubling is ignoring this starting pressure — since the question uses “depth” we must assume it is this typical type of measurement.  

There is also SOME compressibility at extremely great depths (even in water) but this is a small effect.

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