Evaporation

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Evaporation is a type of vaporization that occurs on the surface of a liquid as it changes into the gas phase. The surrounding gas must not be saturated with the evaporating substance. When the molecules of the liquid collide, they transfer energy to each other based on how they collide with each other.

Overview[edit | edit source]

Evaporation happens when atoms or molecules escape from the liquid and turn into a vapor. Not all of the molecules in a liquid have the same energy. When you have a puddle of water (H2O), it doesn't all evaporate at once. This is because as the temperature increases, more molecules have enough energy to overcome the intermolecular forces and start to turn into a gas.

Factors affecting evaporation[edit | edit source]

Several factors can affect the rate of evaporation;

  • Temperature: The higher the temperature, the faster the evaporation. This is because as the temperature of the liquid increases, the kinetic energy of its molecules also increases.
  • Surface area: A larger surface area allows more liquid to be in contact with the air, allowing for more evaporation to occur.
  • Humidity: The lower the humidity, the faster the evaporation. If the air is already saturated with water vapor, it can reduce the rate of evaporation.
  • Wind speed: The higher the wind speed, the more rapidly the water evaporates. This is because the wind moves the air away from the surface of the water, making it easier for new air molecules to come into contact with the water.

Applications of evaporation[edit | edit source]

Evaporation is used in many everyday applications such as:

  • Distillation: A process that uses evaporation and condensation to purify water or separate liquids from each other.
  • Evaporative cooling: A process that uses the heat absorbed by evaporation to cool an environment.
  • Drying: Removing water from materials such as clothes or dishes by evaporation.

See also[edit | edit source]

Evaporation Resources
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Contributors: Prab R. Tumpati, MD