You wish to measure the temperature and pressure of steam fl owing in a pipe. To do this task, you connect a well-insulated tank of volume 0.4 m3 to this pipe through a valve. This tank initially is at vacuum. The valve is opened, and the tank fi lls with steam until the pressure is 9 MPa. At this point the pressure of the pipe and tank are equal, and no more steam fl ows through the valve.
The valve is then closed. The temperature right after the valve is closed is measured to be 800ºC.
The process takes place adiabatically. Determine the temperature (in [K]) of the steam fl owing in the pipe. You may assume the steam in the pipe stays at the same temperature and pressure throughout this process.

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Steam T= ? P = 9 MPa Initially vacuum State 1 Steam T= ? P = 9 MPa HO State 2 _P = 9 MPa T = 800C