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standard pressure[′stan·dərd ′presh·ər]
The arbitrarily selected atmospheric pressure of 1000 millibars to which adiabatic processes are referred for definitions of potential temperature, equivalent potential temperature, and so on.
A pressure of 1 atmosphere (101,325 newtons per square meter), to which measurements of quantities dependent on pressure, such as the volume of a gas, are often referred. Also known as normal pressure.
standard atmospheric pressure
The pressure exerted by a standard atmosphere; also see atmospheric pressure.