Melting Point:
* The temperature at which a solid substance changes into a liquid state.
* At the melting point, the solid and liquid phases exist in equilibrium.
* This is a physical change, not a chemical change.
* Example: The melting point of ice is 0°C (32°F).
Boiling Point:
* The temperature at which a liquid substance changes into a gaseous state.
* At the boiling point, the liquid and gas phases exist in equilibrium.
* This is a physical change, not a chemical change.
* Example: The boiling point of water is 100°C (212°F) at standard atmospheric pressure.
Key Points:
* The melting and boiling points are characteristic properties of a substance and can be used to identify it.
* These points are affected by pressure. Higher pressure generally increases the melting and boiling points.
* Impurities can affect the melting and boiling points of a substance.
In Summary:
Melting point and boiling point are important physical properties that describe the temperature at which a substance changes its state of matter. They are useful for identifying substances and understanding their behavior under different conditions.
