The standard gas flow rate is the gas flow rate expressed at standard conditions of temperature (20°C or 68°F) and pressure (14.7 psia or 407 in. W.C.). Standard gas flow rates can be expressed in units of Standard Cubic Feet per Minute (SCFM) and Standard Cubic Meters per Minute (Nm3/min). The SCFM and Nm3/min values are measures of the total quantity of gas being handled per minute and therefore are directly related to the number of gas molecules handled during that time period. They are also the volumes that these amounts of gas occupy at standard temperature and pressure.