| Term | Definition |
|---|
| Pressure | The force exerted on a surface divided by the total area over which the force is exerted. |
| Pascal | A unit of pressure equal to one Newton per square meter. |
| Fluid | A substance that can easily change shape. |
| Pascal’s principle | The rule that when force is applied to a confined fluid, the increase in pressure is transmitted equally to all parts of the fluid. |
| Hydraulic system | A system that multiplies force by transmitting pressure from a small surface area through a confined fluid to a larger surface are. |
| Buoyant force | The upward force exerted by a fluid on a submerged object. |
| Archimedes’ principle | The rule that the buoyant force on an object is equal to the weight of the fluid displaced by that object. |
| Density | The mass of a substance contained in a unit of volume. |
| Bernoulli’s principle | The rule that a stream of fast-moving fluid exerts less pressure than the surrounding fluid. |
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