Do molecules ever stop moving

Answer 1

No, molecules never stop moving. The movement of molecules is a result of their individual kinetic energy, which is a measure of their motion. Even at absolute zero (-273.15°C or 0 Kelvin), where molecular motion is at its minimum, molecules still exhibit some residual vibrations. Therefore, molecules are always in constant motion, although the extent and speed of the motion can vary depending on various factors such as temperature and pressure.