# Pressure

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).

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

High 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 ... 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) ... received a Nobel prize for advancing this area of physics by several magnitudes of pressure (400 MPa to 40,000 MPa) ...
Pascal (unit) - Uses - Hectopascal and Millibar Units
... Meteorologists worldwide have 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 thousand millibars to provide the ... After the introduction of SI units, many preferred to preserve the customary pressure figures ... as 100,000 pascals, which is only slightly lower than standard air pressure on Earth ...
Pascal (unit)
... 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, inventor, writer, and ... On Earth, standard atmospheric pressure is 101 325 Pa ... Meteorological barometric pressure reports typically report atmospheric pressure in hectopascals ...
Types - Kinematic 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 ...
Pascal (unit) - Uses
... The pascal (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 ... Other, 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 ...

### 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)

The mother whose self-image is dependent on her children places on those children the responsibility for her own identity, and her involvement in the details of their lives can put great pressure on the children. A child suffers when everything he or she does is extremely important to a parent; this kind of over-involvement can turn even a small problem into a crisis.
Grace Baruch (20th century)

Much of the pressure contemporary parents feel with respect to dressing children in designer clothes, teaching young children academics, and giving them instruction in sports derives directly from our need to use our children to impress others with our economic surplus. We find “good” rather than real reasons for letting our children go along with the crowd.
David Elkind (20th century)