Heat Transfer - Evaporation
A series of free Science Lessons for 7th Grade and 8th Grade, KS3 and Checkpoint Science in preparation for GCSE and IGCSE Science.
Heat transfer by evaporation
How heat can be transferred by evaporation?
What happens in evaporation in terms of the particles involved?
Evaporation happens when particles at the surface of a liquid gain enough kinetic energy to break their liquid bonds and escape as a gas.
Evaporation causes cooling because only the faster (hotter) liquid particles escape leaving the slower (cooler) particles behind.
What are the factors which can increase the rate of evaporation?
- Temperature of liquid
- Movement of air
- Dryness of air
- Surface area
Cooling By Evaporation Demonstration
Diethyl Ether (Ethoxyethane) is used to show how the temperature of its container drops when it evaporates. A comparison is made with sweating.
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