Liquid to Vapour Change Below Boiling Point: Evaporation

The question asks to identify the phenomenon where a liquid converts into vapour at any temperature that is below its boiling point.

Understanding the Process

This specific type of phase transition is known as evaporation. Evaporation is a surface phenomenon that occurs at temperatures below the boiling point. In contrast, boiling occurs at a specific temperature (the boiling point) throughout the bulk of the liquid.

Analyzing the Options

• Solidification: This is the process where a liquid turns into a solid.
• Evaporation: This is the process where a liquid turns into a vapour at any temperature below its boiling point. This matches the definition provided in the question.
• Condensation: This is the process where a vapour turns into a liquid.
• Sublimation: This is the process where a solid directly turns into a vapour without passing through the liquid phase.

Based on the definitions, the change of a liquid into vapour at any temperature below its boiling point is correctly identified as evaporation.