Use the SL system state daemon to verify that u and s are independent of p for pure solids and liquids (Hint: Select a solid or a liquid; Evaluate three states at, say, 100 kPa, 1 MPa, and 10 MPa at a constant temperature of, say, 300 K; draw the u-T and s-T diagrams using the pull-down menu. Use the p = c button. Repeat with different working substances and different temperatures).