Gas flows through the narrow end (nozzle) of a pipe. Under certain conditions, the mass 
of gas that flows through the nozzle in a short time 
is given by:
where:
is a constant with no units,
is a quantity that depends on the nozzle size,
is the density of the gas arriving at the nozzle,
is the pressure of the gas arriving at the nozzle.
Determine the base units of .
.
