Boiling point and melting point are key temperature points for phase changes in substances.
Boiling point is the temperature at which a liquid turns into a gas. It is affected by surrounding pressure. The normal boiling point is at 1 atm pressure.
Melting point is when a solid turns into a liquid, and freezing point is when a liquid turns into a solid, both at specific temperatures for each substance.
At the melting or boiling point, two phases can coexist for a substance, like water at 0°C and 100°C on the Celsius scale.
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