Answer
The sections BC and DE show energy going into the system but no change in temperature. Therefore, these two sections indicate phase changes.
In section BC, the substance is changing from a solid to a liquid while in section DE, the substance is changing from a liquid to a gas.
Work Step by Step
During a phase change, energy continues going into the system but the temperature does not increase.
The sections BC and DE show energy going into the system but no change in temperature. Therefore, these two sections indicate phase changes.
In section BC, the substance is changing from a solid to a liquid while in section DE, the substance is changing from a liquid to a gas.
