Region 2 of the graph showing the temperature and the time shows that the substance is in both liquid and solid phases. Thus, region 2 is the correct option.
What is the matter phase?
The phases of the matter are the arrangement of the constituent particles of the atoms in a space that defines the solid, gas, and liquids. The phases of the matter can exist together under certain conditions.
When the melting points of the sold and the liquid are at equilibrium then the point of crystallization exists. In the graph, the temperature remains constant and does not change with time.
Therefore, the solid and liquid phases exist in region 2.
Learn more about the phases of the matter here:
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