The invariant reaction involving a solid phase decomposing into two different solids on cooling is known as ____________

A phase diagram is a graphical representation of the physical states of a substance under different conditions of temperature and pressure. It shows the conditions at which thermodynamically distinct phases (such as solid, liquid or gaseous states) occur and coexist at equilibrium. A typical phase diagram has pressure on the y-axis and temperature on the x-axis. As the lines or curves on the phase diagram are crossed, a phase change occurs. A single phase refers to the solid, liquid or vapour (or gaseous) phase that a substance exists at a certain condition. Phase diagrams are used in... Show more

A phase diagram is a graphical representation of the physical states of a substance under different conditions of temperature and pressure. It shows the conditions at which thermodynamically distinct phases (such as solid, liquid or gaseous states) occur and coexist at equilibrium.
A typical phase diagram has pressure on the y-axis and temperature on the x-axis. As the lines or curves on the phase diagram are crossed, a phase change occurs.
A single phase refers to the solid, liquid or vapour (or gaseous) phase that a substance exists at a certain condition.

Phase diagrams are used in physical chemistry, engineering, mineralogy, and materials science.

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