Force - A push or pull acting upon a body. In a hydraulic cylinder, it is the product of the pressure on the fluid, multiplied by the effective area of the cylinder piston. It is measured in pounds or tons. Friction - The resistance to fluid flow in a hy- draulic system.
temperature increase The pressure of a contained sample of gas can be increased by increasing its temperature, or by decreasing its volume, or by injecting additional mas â¦ s into it.
1 For every 10 metres (33 ft) in seawater the diver descends, the pressure increases by 1 bar (15 psi). 2  As a diver goes deeper, the breathing gas is delivered at a pressure equal to ambient water pressure, and the amount of gas used is proportional to the pressure.