2.2.9

Evaporation

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Evaporation

Evaporation describes a liquid changing state into a gas without boiling.

Illustrative background for EvaporationIllustrative background for Evaporation ?? "content

Evaporation

  • In a liquid, different particles (e.g molecules) can travel at different speeds.
  • The molecules moving fastest have the most energy, they may have enough energy to escape from the surface of the liquid and enter the gas above.
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Evaporative cooling

  • The higher the temperature of a liquid, the higher the kinetic energy of the liquid's molecules.
  • If the molecules with the most energy leave a liquid, then the molecules left in the liquid will have a lower average energy and a lower average temperature (cooling the liquid).
Illustrative background for Evaporation is not boilingIllustrative background for Evaporation is not boiling ?? "content

Evaporation is not boiling

  • Evaporation can happen at any temperature.
  • Evaporation only happens at the surface of a liquid (boiling happens everywhere in a liquid).
  • Boiling needs extra energy to be transferred to the liquid, but evaporation doesn’t.

Jump to other topics

1Motion, Forces & Energy

1.1Physical Quantities & Measurement Techniques

1.2Motion

1.3Mass & Weight

1.4Density

1.5Forces: Effects of Forces

1.6Forces: Turning Effects of Forces

1.7Forces: Centre of Gravity

1.8Momentum

1.9Energy, Work, & Power: Energy

1.10Energy, Work & Power: Work

1.11Energy, Work & Power: Energy Resources

1.12Energy, Work & Power: Power

1.13Pressure

2Thermal Physics

3Waves

4Electricity & Magnetism

4.1Simple Phenomena of Magnetism

4.2Electrical Quantities: Electric Charge

4.3Electrical Quantities: Electric Current

4.4Electromotive Force & Potential Difference

4.5Electrical Quantities: Resistance

4.6Electrical Energy & Electrical Power

4.7Electric Circuits: Circuit Diagrams & Components

4.8Electric Circuits: Series & Parallel Circuits

4.9Electric Circuits: Action & Use

4.10Electrical Safety

4.11Electromagnetic Effects: Electromagnetic Induction

4.12Electromagnetic Effects: The A.C. Generator

4.13Magnetic Effect of a Current

4.14Force on a Current-Carrying Conductor

4.15Electromagnetic Effects: The D.C. Motor

4.16Electromagnetic Effects: The Transformer

5Nuclear Physics

6Space Physics

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