Enthalpy changes accompanying a change of state are than those accompanying the heating of a substance at each state.

What causes the formation of ocean currents?

What happens when a rubber rod is rubbed with a piece of fur?

In the illustration, which two simple machines are being used to enable the student to reach the door? a. inclined plane and pulley b lever and wheel-and-axle c pulley and lever d wheel-and axle and inclined plane