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answered Feb 3, 2015 by gagonza (3,020 points)

Standard flow rate is a correction applied to an actual flow measurement based on a given temperature and pressure. The correction is applied using the ideal gas law. The most widely used value is 1 atmosphere (101.3 kPa) or 14.696 psia at sea level and 59 0F (150C).

Normal flow rate is 1 atmosphere (101.3 kPa) or 14.696 psia at 32 0F (0 0C).

Actual flow rate is the actual volume of fluid that passes a given point based on given pressure and temperature of the process. 

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