Vaporization is the process by which a substance transitions from the liquid phase to the gas phase. This process can occur through two main methods: evaporation and boiling. 1. **Evaporation**: This is a gradual process that takes place at the surface of a liquid at any temperature. It occurs when molecules at the surface gain enough energy to overcome intermolecular forces and escape into the vapor phase. This can happen even at temperatures below the boiling point of the liquid.
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Vaporization changes a liquid into a gas. It includes evaporation at a surface and boiling within the liquid. Below the liquid-gas critical point, equilibrium conversion along the liquid-vapour phase coexistence curve involves latent heat; the liquid and vapour have equal chemical potential there.