# Water Pressure Under Water.

*Most recent answer: 07/08/2015*

Q:

I have a 1 sq in cylinder that is filled 1000 feet underwater. What appx. force is needed to remove a piston from the cylinder at this depth if all ports in the cylinder are closed off.

- Pete Aston (age 57)

Houston, Texas, USA

- Pete Aston (age 57)

Houston, Texas, USA

A:

Hello Pete,

The basic physics argument is that theextra pressure **P** of a liquid at any depth** **is equal to the density times the height **h** of the liquid and the total** force** on a surface is just the pressure times the area of the surface * A*. There is a handy-dandy pressure calculator at

LeeH

*(published on 07/08/2015)*