Determine the mass specific internal energy (u) of the following two substances at the given conditions. Also determine which (if either) of these substances can be well-approximated as: 1) a thermally perfect gas at these conditions; 2) an incompressible substance at these conditions; and 3) a calorically perfect substance over the temperature range 250-1000 K (for each of these last three questions, your answer would be Substance 1, Substance 2, both or neither; along with justifications for your responses). Substance p (bar) T (K) p (kg/m) h (kJ/kg) 1 1.00 250. 75.3 1.3 1 30.0 250. 76.3 40.3 1 30.0 500. 73.5 260.8 1 30.0 1000. 67.4 704.5 1.00 250. 2.4 41.2 30.0 250. 68.3 43.9 30.0 500. 1000. 35.5 194.5 30.0 18.0 556.6 N222