Argon escapes into the atmosphere at 0.101325 MPa from a 1.00 m3 storage tank initially at 5.00 MPa and 25.0°C through a converging-diverging nozzle with a throat area of 1.00 × 10-3 m2 .
a. Is the flow through the nozzle initially choked?
b. If so, at what tank pressure does it unchoke?
c. How long does it take to unchoke if the tank is maintained at 25.0°C?