Here's why:
* Molecular Motion: Liquids are made up of molecules that are constantly moving and colliding with each other. As the temperature increases, the molecules move faster and faster.
* Overcoming Intermolecular Forces: The molecules in a liquid are held together by intermolecular forces (like hydrogen bonds, dipole-dipole forces, etc.). To become a vapor, the molecules need enough energy to overcome these forces and escape into the gas phase.
* Boiling Point: The boiling point is the specific temperature at which the vapor pressure of the liquid equals the pressure surrounding the liquid. At this point, the molecules have enough energy to break free from the liquid and become a gas.
There are two ways vaporization can occur:
* Boiling: This is the process where the liquid reaches its boiling point and vaporizes throughout the entire volume.
* Evaporation: This is the process where molecules at the surface of the liquid gain enough energy to escape into the gas phase, even if the liquid is below its boiling point. Evaporation is a slower process than boiling.
