Consider a self-contained underwater breathing app  Consider a
self-contained underwater breathing apparatus (SCUBA) diving
tank with a volume of 18 litres and a maximum pressure rating of
200 bar (gauge). The tank can be pressurized to this 200 bar
pressure limit. Before diving, the tank should be filled with
air via a compressor, capable of delivering air at a 4.2 ft /min
flow rate. The valve, through which air enters (or leaves) the
tank, has 3 a throat diameter of 12 mm. The tank is to be filled
on a nice sunny day, when the temperature is 30°C and the
atmospheric pressure is 102 kPa. For simplicity, you may assume
that while filling the tank the temperature throughout the
compressor, the feed lines and the tank remains uniform and
equal to the ambient temperature of 30 C. O Note that the
universal gas constant for air is R = 287.053 J/kg/K. Your task
is to determine various details of the filling and discharging
of the tank, namely: (1) Determine the mass of air (in terms of
kg units) inside the tank jus