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Pounds per square in is a unit for measuring pressure (force per unit area). Absolute pressure is the pressure (eg in a gas) compared to a vacuum, where the pressure is zero. Often we measure the pressure relative to the atmosphere, which has a pressure of about 14.7 pounds per square inch (psi). This relative pressure is called the gauge pressure. So a (gauge) pressure of 30 psi in a car tyre is really an absolute pressure of 14.7 + 30 = 41.7 psi. See http://en.wikipedia.org/wiki/Pressure http://wiki.answers.com/Q/What_is_absolute_pressure

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