Consider substance 1 of density is melting at absolute temperature I and the pressure P to form another substance. What is the change in internal energy in the process of melting of 1 gram of substance 1? Let Pibe the density of substance 1, P: be the density of substance 2, and I be the latent heat of melting of 1 gram of substance 1. (a) L+P (b) L+P (c) L-P (d) L-P 1 P 1 A 31-31-01- 1 P P 1 P Pr