Evaporation & Condensation - Oxford AQA IGCSE Physics

Front

What is evaporation?

Back

Evaporation is a change in the state of a liquid to a gas. It has a cooling effect and occurs at any temperature, unlike boiling which only occurs at the boiling point.

Front

How does evaporation differ from boiling?

Back

Evaporation happens at any temperature and only affects particles at the surface of the liquid, while boiling occurs at the boiling point and affects particles throughout the liquid

Front

What happens to the molecules during evaporation?

Back

More energetic molecules near the surface of the liquid escape, reducing the average kinetic energy of the liquid and causing it to cool down.

Front

How does temperature affect evaporation?

Back

Increased temperature increases the kinetic energy of molecules, making them more likely to overcome intermolecular forces and escape, thus increasing the rate of evaporation.

Front

What role does surface area play in evaporation?

Back

A larger surface area allows more molecules to escape, leading to a higher rate of evaporation.

Front

How does air movement affect evaporation?

Back

Air movement carries away evaporated water vapor, drying the air and allowing more water molecules to escape, thus increasing the rate of evaporation.