Evaporation


Definition of Evaporation

Evaporation is the process by which water changes from liquid to vapour below its boiling point.

More About Evaporation:


    Generally on heating water boils and changes to vapour at 1000C. But below or less than this temperature (1000) if we change water into vapour, this process is known as evaporation.

    Example: Even on a cool day, rain puddles can vanish.
    Wet clothes dry out at room temperature.
    It happens because some particles in the liquid move faster than others. The faster ones near the surface have sufficient energy to escape from the objects (clothes) and form gas.
  • Evaporation is the first process of the water cycle.
  • 90% of the moisture in atmosphere is getting through evaporation.
  • Condensation is opposite of evaporation.
  • Ocean, lake and river provide moisture via evaporation.
  • More evaporation takes place at high temperatures.
  • Example: Wet clothes dry faster on a warm day
  • More evaporation takes place on large surface area.
  • Example: Water in a puddle dries out more quickly than water in a cup because more of its molecules are close to the surface.
  • Evaporation can be increased by blowing air across the surface.
  • Example: Wet clothes dry faster on a windy day (or by placing the same under fan)
  • Evaporation has cooling effect. After the evaporation the object left will be cool
  • Example: After sweating human body cools down.
    When you wash your hands (or wet) the water on the hands starts to evaporate, as the water evaporates, some of it takes some of the thermal energy from the body, as a result we feel cool.

    Definition of Evaporation




Related Terms: Boiling | Condensation
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