## Glossary of physical science chp. 15

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- hydraulic machines
- machines which use fluid to transmit or increase force

- fluid mechanics
- The study of fluid movement and forces

- Bernoulli's principle
- States that the pressure of a fluid decreases as its speed increases

- fluids
- liquid or gas phases of matter

- Boyle's law
- the volume of a dry gas is inversely proportional to the pressure it exerts, if the temperature remains constant

- pressure
- the force pushingdirectly on a given surface

- Archimedes' principle
- the buoyant force exerted on a body in a fluid is equal to the weight of the fluid displaced

- pascal (Pa)
- unit of pressure equal to one newton of force over a square meter (NN/m(2))

- Pascal's principle
- changes in pressure in a confined fluid are distributed equally in all directions throughout the fluid

- Charles's law
- the volume of a gas at a constant pressure is directly proportional to its Kelvin temperature

- barometer
- a device used to measure atmospheric pressure