Phase Equilibrium: This refers to when two or more phases of a substance coexist without any change. Like standing still at that intersection without moving towards any specific terrain.
Melting Point:The temperature at which a solid turns into a liquid under atmospheric pressure. It's like the boundary between the desert and ocean in our analogy.
Boiling Point:The temperature at which a liquid turns into vapor under specific environmental pressure. It's like the boundary between ocean and sky in our analogy.