1. The problem statement, all variables and given/known data I have the ammonia liquid-vapour tables and I have noticed that the enthalpy of a saturated vapour increases as temperature increases. Can someone please help me to understand why this is the case? 2. Relevant equations H = U + pV 3. The attempt at a solution I assume that at higher temperatures the vapour will have a greater internal energy. Is this why enthalpy increases with temperature? Thanks!