1. The problem statement, all variables and given/known data (i) State the Second Law of Thermodynamics in one or other of its forms. (ii) The heat capacity per unit volume of a particular solid at low temperatures is equal to CT3; find expressions for its internal energy and entropy S per unit volume (ignoring the effects of thermal expansion). 2. Relevant equations 3. The attempt at a solution (i) Kelvin's statement: No process is possible whose sole effect is complete conversion of heat into work. Clausius' statement: No process is possible whose sole effect is to transfer heat from a colder to a hotter body. (ii) Not sure. Any help would be awesome.