Boiling Point:
* The boiling point of a substance is the temperature at which its vapor pressure equals the surrounding atmospheric pressure.
* At this point, the substance changes from a liquid to a gas.
* Exceptions: Some substances decompose before reaching their boiling point, meaning they break down chemically instead of simply changing state.
Freezing Point:
* The freezing point of a substance is the temperature at which it transitions from a liquid to a solid.
* This is also known as the melting point, as the process is reversible.
* Exceptions: Some substances, like glass, don't have a distinct freezing point. Instead, they transition gradually from a liquid to a solid state.
Important Considerations:
* Pressure: Both boiling and freezing points are influenced by pressure. Higher pressure raises the boiling point and lowers the freezing point.
* Impurities: The presence of impurities can slightly alter the boiling and freezing points of a substance.
In summary, while almost all substances have a specific boiling and freezing point, there are some exceptions due to factors like decomposition or the nature of the substance itself.
