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Pressure (symbol: p or P) is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. Gauge pressure (also spelled gage pressure) is the pressure relative to the ambient pressure. Various units are used to express pressure.


Pressure is kind of like force, but not quite. If you're seeing this message, it means we're having trouble loading external resources on our website. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.


Air pressure is often measured with a device called a barometer. Most barometers today measure air pressure in millibars. Changes in the air pressure are important for weather forecasters because they can indicate changes in the weather. Activities Take a ten question quiz about this page. More Physics Subjects on Motion, Work, and Energy


Atmospheric pressure, often noted as p a, is the pressure of the Earth's atmosphere. When you are standing outside in the air, the atmospheric pressure is the average force of all of the air above and around you pushing in on your body.


Pressure, in the physical sciences, the perpendicular force per unit area, or the stress at a point within a confined fluid.The pressure exerted on a floor by a 42-pound box the bottom of which has an area of 84 square inches is equal to the force divided by the area over which it is exerted; i.e., it is one-half pound per square inch.


pres·sure (prĕsh′ər) n. 1. a. The act of pressing. b. The condition of being pressed. 2. The application of continuous force by one body on another that it is touching; compression. 3. Abbr. P Physics Force applied uniformly over a surface, measured as force per unit area. 4. Meteorology Atmospheric pressure. 5. a. A compelling or constraining ...


Pressure as Energy Density. Pressure in a fluid may be considered to be a measure of energy per unit volume or energy density. For a force exerted on a fluid, this can be seen from the definition of pressure: The most obvious application is to the hydrostatic pressure of a fluid, where pressure can be used as energy density alongside kinetic energy density and potential energy density in the ...


In general, pressure is a measure of the force exerted per unit area on the boundaries of a substance. In fluid dynamics and aerodynamics, stagnation pressure (or pitot pressure or total pressure) is the static pressure at a stagnation point in a fluid flow.


pressure (P) [presh´ur] force per unit area. arterial pressure (arterial blood pressure) blood pressure (def. 2). atmospheric pressure the pressure exerted by the atmosphere, usually considered as the downward pressure of air onto a unit of area of the earth's surface; the unit of pressure at sea level is one atmosphere. Pressure decreases with ...