D)2.1 Work, heat, and energy Heat-molecular interpretation Surroundings Heat is the transfer of energy that makes use of chaotic molecular motion The chaotic motion of molecules is called thermal motion. When a system heats its surroundings, molecules Energy Energy of the system stimulate the thermal motion of the molecules System in the surroundings 版权所有:华东理工大学物理化学教研室版权所有：华东理工大学物理化学教研室 7 Heat-molecular interpretation Heat is the transfer of energy that ma kes u se of chaotic molecular motion. The chaotic motion of molecules is called thermal motion. When a system heats its surroundings, molecules of the system stimulate the thermal motion of the molecules in the surroundings. 2.1 Work, heat, and energy