1.2.7 pV flow
Dividing the general gas equation by time t yields the gas flow
Formula 1-11:
pV flow
This is also referred to as pV flow. As can be seen from the right-hand side of the equation, a constant mass flow is displaced at constant temperature T.
Vacuum pumps, particularly positive displacement pumps, have a constant volume flow rate of
Formula 1-12:
Definition of volume flow rate, or pumping speed
over a given inlet pressure range; i.e. they displace a constant volume flow. Multiplying the volume flow rate by the inlet pressure yields the throughput of a pump.
Formula 1-13:
Vacuum pump throughput
Throughput is the gas flow transported by a vacuum pump.
Table 1.6:
Conversion table for units of flow, length and temperature
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