1. The problem statement, all variables and given/known data when heating i learned that only the kinetic energy component of internal energy increases. However, I also learned that potential energy is related to distance between the particles. So when i heat some solid and it expands does it mean the potential energy has changed as well? I don't think that is the reason for the expansion. 2. Relevant equations none 3. The attempt at a solution i understand that it moves faster but i don't think the amplitude of vibration should increase as i don't think the potential energy increases. Thanks for the help!