| A | B |
|---|
| hydraulic | a fluid system that uses a liquid as the fluid |
| pneumatic | a fluid system that uses air or gas as the fluid |
| density | the mass of a substance divided by the volume of the substance |
| volume | V = M/D |
| specific gravity | the density of the substance divided by the density of water |
| buoyant force | the upward force on the object that's equal to the weight of the fluid displaced |
| area | A = F/P or A = Force/Pressure |
| pressure | the force per unit area exerted by a fluid - either a liquid or a gas |
| atmospheric pressure | it acts equally in all directions - upward, downward, or sideways |
| gage pressure | the pressure measured above atomospheric pressure |
| psi | the amount of pressure in an object |
| absolute pressure | the total pressure measured above a reference of zero pressure |
| manometer | used to measure gas pressure and pressure difference between two points in a system |
| equation for pressure in an "open" system | P = Pwxh |
