Question

On a temperature versus time graph, how does the temperature at the beginning of a change of state compare with the temperature at the end of the change?

Answer 1

On a temperature vs. time graph, the temperature at the beginning of a phase change is equal to the temperature at the end of the change. This is because at the instant a phase change occurs, there is no change in temperature involved. Instead, the energy involved with a change in state is called the latent heat.