Main Question or Discussion Point
I've heard molecules are constantly moving or vibrating. What is the mechanism behind this? Where does the energy come from, and go? Is it always a function of temperature/pressure?
Generally speaking these oscillations are driven by coulomb forces. For more details you may want to read about quantum oscillator.What is the mechanism behind this?
Molecule that is excited just 'has' its energy, and its energy doesn't change. You may say that this energy is stored in vibrations.Where does the energy come from, and go?
For a given molecule (to some extent for a given bond) frequency of the possible vibrations is independent on the surroundings. however, which frequencies dominate depends on the molecule energy, which in turn is a function of the temperature.Is it always a function of temperature/pressure?