A phase diagram is a convenient means of representing the temperature and pressure dependence of a pure substance in a closed system. The typical phase diagram indicates which phase (solid, liquid, or gas) is stable at a given temperature and pressure. Boundaries separate these phase regions. When a boundary line is crossed owing to changes in temperature and/or pressure a phase change occurs.
Identify each of the labeled points (indicated with letters) or changes (indicated with two letters separated by an arrow.
Match the words in the left-handed column with the appropriate blank in the sentences in the right-hand column.