Molar flow rate converter
Convert molar flow between mol/s, kmol/h, lb-mol/h and standard gas flow units.
That's 4.3× as much flow as a car's exhaust at motorway speed, while a world-scale ammonia plant is 367× more flow. As an ideal gas at 0 °C and 1 atm, that is 3,736 liters per minute.
What it means
How much flow is that?
Standard-volume units assume an ideal gas: 0 °C and 1 atm for SLPM and sccm, 60 °F and 1 atm for SCFM. Reference values are typical.
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Learn
Three things worth knowing
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22.4 litres to the mole
An ideal gas at 0 °C and 1 atm fills 22.4 L per mole, so 1 SLPM is about 0.744 mmol/s.
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Avogadro's insight
Equal volumes of gas at the same temperature and pressure hold equal numbers of molecules. That is what lets a volume flow stand in for a molar one.
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"Standard" is not standard
Makers use 0 °C, 20 °C, 25 °C or 60 °F. The same SLPM can differ by 9% between them, so check what your flow controller assumes.
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Background
About molar flow
Chemical plants keep their books in moles, because reactions do: three molecules of hydrogen meet one of nitrogen, whatever they weigh. Process flowsheets are drawn in kmol/h.
Gas controllers quote "standard" litres or cubic feet instead. Once the standard temperature and pressure are fixed, those are moles in disguise.