Converting between Volumetric and Mass Flowrates for Gases

This is a screen shot from the professional units conversion program "Uconeer" from Katmar Software. It is designed specifically for engineers and scientists. Click here to read the full program description.

This function will allow you to convert between volumetric flow rate and mass flow rate for gases. If you know the gas density you can enter it directly. If you do not know the density the program will estimate it for you from the molecular weight using the ideal gas law, or using the gas compressibility if you know it, or it will estimate the compressibility using the Peng Robinson Equation of State.

Critical data for the following common gases is built into the program : air, ammonia, iso-butane, n-butane, carbon dioxide, carbon monoxide, chlorine, ethane, ethylene, helium, hydrogen, methane, nitrogen, oxygen, propane, propylene.

Pressure and temperature conditions for standard reference conditions are built in making it easy to convert between volumetric flows based on actual conditions (acfm), normal conditions (Nm³/s), standard conditions (scfm) and mass or weight based flows. This also makes it possible to convert between actual flows and standard flows, or between standard flows based on different standard conditions (eg converting from scfm to Nm³/h). There is even provision for adding in your own definition of standard conditions.

A similar, but simpler, calculator is also included for converting liquid flowrates between volumetric and mass flow.

Gas flowrate conversions