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| the acceleration of a falling body in the earth's gravitational field, inversely proportional to the square of the distance from the body to the center of the earth |
| a particle having the same mass and spin as an electron but having a positive charge equal in magnitude to that of the electron's negative charge |
| pressure (ˈprɛʃə) | |
| —n | |
| 1. | the state of pressing or being pressed |
| 2. | the exertion of force by one body on the surface of another |
| 3. | a moral force that compels: to bring pressure to bear |
| 4. | an urgent claim or demand or series of urgent claims or demands: to work under pressure |
| 5. | a burdensome condition that is hard to bear: the pressure of grief |
| 6. | p, P the normal force applied to a unit area of a surface, usually measured in pascals (newtons per square metre), millibars, torr, or atmospheres |
| 7. | atmospheric pressure short for blood pressure |
| —vb | |
| 8. | (tr) to constrain or compel, as by the application of moral force |
| 9. | another word for pressurize |
| [C14: from Late Latin pressūra a pressing, from Latin premere to press] | |
| 'pressureless | |
| —adj | |
pressure pres·sure (prěsh'ər)
n.
The act of pressing or condition of being pressed.
A stress or force acting in any direction against resistance.
Force applied uniformly over a surface, measured as force per unit of area.
| pressure (prěsh'ər) Pronunciation Key
The force per unit area that one region of a gas, liquid, or solid exerts on another. Pressure is usually measured in Pascal units, atmospheres, or pounds per square inch. ◇ A substance is said to have negative pressure if some other substance exerts more force per unit area on it than vice versa. Its value is simply the negative of the pressure exerted by the other substance. |
The force exerted on a given area. (See atmospheric pressure.)
Note: The most familiar measure of pressure is psi (pounds per square inch), used to rate pressure in automobile and bicycle tires.