Surface Pressure

Surface pressure often refers to the atmospheric pressure at a location on Earth's surface. It is directly proportional to the mass of air over that location.

For numerical reasons, atmospheric models such as general circulation models (GCMs) usually predict the nondimensional logarithm of surface pressure.

The average value of surface pressure on Earth is 985hPa. This is in contrast to mean sea-level pressure, which involves the extrapolation of pressure to sea-level for locations above or below sea-level. The average mean sea-level pressure is 1013.25hPa, or 1 atmosphere (Atm).

Pressure (P), mass (m), and the acceleration due to gravity (g), are related by P = F/A = (m*g)/A, where A is surface area. Atmospheric pressure is thus proportional to the weight per unit area of the atmospheric mass above that location.

Surface Pressure - Area Isotherms

Other articles related to "surface pressure, surface, pressure":

Langmuir–Blodgett Troughs - Parts - Balance
... An important property of the system is its surface pressure (the surface tension of the pure subphase minus the surface tension of the subphase with amphiphiles ... The surface pressure – molecular area isotherm is one of the important indicators of monolayer properties ... Additionally, it is important to maintain constant surface pressure during deposition in order to obtain uniform LB films ...
Quecreek Mine Rescue - Rescue Operations
... Additional borehole locations were surveyed on the surface for holes to be drilled into the lowest area in the mine ... Friday, but due to its nominally larger size, the hole had to be enlarged from the surface ... decompression sickness, due to their breathing air which was at a higher pressure than the surface pressure, due to the pressure of the surrounding water ...
Atmosphere Of Titan - History
... using a spectroscopic technique that yielded an estimate of an atmospheric partial pressure of methane of the order of 100 millibars (10 kPa) ... underestimates methane abundances in Titan's atmosphere were ten times higher, and the surface pressure was at least double what he had predicted ... The high surface pressure meant that methane could only form a small fraction of Titan's atmosphere ...
Langmuir–Blodgett Film - Pressure–Area Characteristics
... Adding a monolayer to the surface reduces the surface tension, and the surface pressure, is given by the following equation where, is equal to the surface tension of the water and is the surface ... But the concentration-dependence of surface tension (similar to Langmuir isotherm) is as follows = RTKHC = – RT Thus, or, The last equation indicates a relationship similar to ideal gas law ... it should be noted that the concentration-dependence of surface tension is valid only when the solutions are dilute and concentrations are low ...

Famous quotes containing the words pressure and/or surface:

    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.
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    White Pond and Walden are great crystals on the surface of the earth, Lakes of Light.... They are too pure to have a market value; they contain no muck. How much more beautiful than our lives, how much more transparent than our characters are they! We never learned meanness of them.
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