Hi! I'm new to the forums, so I apologize in advance if I'm posting my question in the wrong section. I'm studying thermodynamics right now, and I came across this sentence from my book: 1. The problem statement, all variables and given/known data "When energy is added to a system and there is no change in the kinetic or potential energy of the system, the temperature of the system usually rises." 2. Relevant equations Volume is proportional to Temperature Internal Energy= Bond energy + Thermal energy 3. The attempt at a solution I'm confused. Wouldn't adding energy to the system increase the system's internal energy (therefore inc. its kinetic/potential energy)? The only way I can see the above statement to be true is if there was an increase in volume of the system. And since volume is proportional to temperature, the temperature of the system would also rise. Are my assumptions correct or am I overthinking it?