In a typical phase diagram of water, which numbered point on the graph represents the phase change known as melting?

A phase change graph for a substance shows a plateau at 45 °C as heat is added at constant pressure. What is the melting point of this substance?

At the melting point and boiling point of a pure substance, what occurs as heat is added at constant pressure?

Which best describes the behavior of atoms in a solid substance that is melting into a liquid?

Which process describes the direct transition of a solid into a vapor without passing through the liquid phase?

Which of the following best defines the critical pressure in a phase diagram?

In a phase diagram for water, what is the name of the point at which water changes from a liquid to a solid?

Which of the following best describes what occurs during condensation?

When water vapor is cooled at constant pressure, which phase change is most likely to occur?