**Pressure** (the symbol: *p*) is the ratio of force to the area over which that force is distributed. In other words, pressure is force per unit area applied in a direction perpendicular to the surface of an object. Gauge pressure (also spelled *gage* pressure) is the pressure relative to the local atmospheric or ambient pressure. While pressure may be measured in any unit of force divided by any unit of area, the SI unit of pressure (the newton per square metre) is called the *pascal* (Pa) after the seventeenth-century philosopher and scientist Blaise Pascal. A pressure of 1 Pa is small; it approximately equals the pressure exerted by a dollar bill resting flat on a table. Everyday pressures are often stated in kilopascals (1 kPa = 1000 Pa).

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### Other articles related to "pressure, pressures":

... for a long time measured atmospheric

**pressure**in bars, which was originally equivalent to the average air

**pressure**on Earth the bar was divided into a ... After the introduction of SI units, many preferred to preserve the customary

**pressure**figures ... pascals, which is only slightly lower than standard air

**pressure**on Earth ...

**Pressure**

... High

**pressure**in science and engineering is studying the effects of high

**pressure**on materials and the design and construction of devices, such as a diamond ... By high

**pressure**it is usually meant

**pressures**of thousands (kilobars) or millions (megabars) of times atmospheric

**pressure**(about 1 bar or 100,000 Pa) ... Bridgman received a Nobel prize for advancing this area of physics by several magnitudes of

**pressure**(400 MPa to 40,000 MPa) ...

... Pa) or kilopascal (kPa) as a unit of

**pressure**measurement is widely used throughout the world and has largely replaced the pounds per square inch (psi) unit ... older units of measure occasionally used for

**pressure**are millimeters of mercury (Torr) and millimetres of water (1.0 mmH2O = 9.80665 Pa) ... In the cgs system, the unit of

**pressure**is the barye (symbol ba), which is equal to one decipascal ...

... The pascal (symbol Pa) is the SI derived unit of

**pressure**, internal

**pressure**, stress, Young's modulus and tensile strength, named after the French mathematician, physicist ... On Earth, standard atmospheric

**pressure**is 101 325 Pa ... Meteorological barometric

**pressure**reports typically report atmospheric

**pressure**in hectopascals ...

**Pressure**

... is the kinematic

**pressure**, where is the

**pressure**and constant mass density ... Kinematic

**pressure**is used in the same manner as kinematic viscosity in order to compute Navier-Stokes equation without explicitly showing the density ...

### Famous quotes containing the word pressure:

“The area [of toilet training] is one where a child really does possess the power to defy. Strong *pressure* leads to a powerful struggle. The issue then is not toilet training but who holds the reins—mother or child? And the child has most of the ammunition!”

—Dorothy Corkville Briggs (20th century)

“This is a catastrophic universe, always; and subject to sudden reversals, upheavals, changes, cataclysms, with joy never anything but the song of substance under *pressure* forced into new forms and shapes.”

—Doris Lessing (b. 1919)

“Amid the *pressure* of great events, a general principle gives no help.”

—Georg Wilhelm Friedrich Hegel (1770–1831)