The relationship between air mass flow rate and volume flow rate in electric air heaters

The relationship between air mass flow rate and volume flow rate in electric air heaters
The air is colorless and odorless, in a gaseous state. At 0 ℃ and one standard atmospheric pressure (1.013 × 10 ^ 5 Pa) density of air is 1.29Kg/m3. The state of the gas at 0 ℃ and a standard atmospheric pressure is called the standard state, and the air in the standard state can be regarded as ideal gas with a molar volume of 22.4L/mol.
The relationship between air mass flow rate and air volume flow rate: The conversion coefficient between air volume flow rate and air mass flow rate is 1.29. To convert the volume flow rate of air into mass flow rate, a coefficient of 1.29 needs to be multiplied.
Example: The mass of air passing through in t hour is m kg, the volume is V m3, and the density of air is known ρ= 1.29 kilograms per cubic meter.
So the volume flow rate of the air qv=V/t (cubic meters per hour), and the mass flow rate qm=m/t (kilograms per hour).
Since air mass=density of air x air volume, i.e. m= ρ V=1.29V。
So qm=m/t= ρ V/t= ρ qv=1.29qv。
To convert the volume flow rate of air into mass flow rate, a coefficient of 1.29 needs to be multiplied.