kilomole

The kilomole is the chemist's mole scaled to plant size, and process simulation is where it actually lives: the stream tables of a flowsheet report every component in kmol/h, because a plant moving tonnes per hour would need six-digit mole counts. The convenience is that molar masses keep their familiar digits on the way up, since 18 g/mol and 18 kg/kmol are the same statement.

For a sense of the size, a kilomole of water is 18 kg, a bucketful, while a kilomole of air weighs 29 kg and occupies about 24 m³ at room conditions, a small bedroom. That gas-side largeness is the working fact of the unit. The gas trade sells volume at reference conditions, and one kilomole of any ideal gas is 22.414 normal cubic metres, gas measured at 0 °C and 101.325 kPa, so dividing a pipeline flow in Nm³/h by 22.414 turns it into kmol/h in a single step. That division is performed somewhere in every gas plant's daily accounting.

The 22.414 is the same number generations of students met as litres per mole at STP; the kilomole simply promotes it to cubic metres. The stoichiometry and ideal-gas solvers on this site accept either scale, with the factor of 1000 between mol and kmol as the entire conversion.