Steam initially at 20 MPa, T = 550°C is expanded to 0MPa at constant entropy. Compute final quality.

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Steam initially at 20 MPa,T = 550°C is expanded to 0MPa at constant entropy. Compute final quality. Three argon atoms (MW=40 g/mol) are moving with (x,y,z)velocities in m/s of (285,-435,100), (-90,295,-25),(-175,-125,-50). Estimate the temperature (K) of this fluid. . . .