This definition is not entirely satisfactory, however. Changes of state (e.g., fromice to water or from water to steam) involve the transfer of heat to or from a body witlzout any change in temperature. It should also be kept in 11nd that heat transfer is not the only way to change the temperature of matter: a body that haswork done on it may become hotter as a result, and a body that does work on something else may become cooler. A more precise definition of heat is: