Evaporation

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Mount Carmel School,AN, New Delhi
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Evaporation

  1. 1. Made by: Shivansh ; 9-B
  2. 2. IntroductionIntroduction Evaporation is the change of state in a substance fromEvaporation is the change of state in a substance from a liquid to a gas. In meteorology, the substance wea liquid to a gas. In meteorology, the substance we are concerned about the most is water. Forare concerned about the most is water. For evaporation to take place, energy is required. Theevaporation to take place, energy is required. The energy can come from any source; the sun, theenergy can come from any source; the sun, the atmosphere, the earth, or objects on the earth such asatmosphere, the earth, or objects on the earth such as humans.humans.
  3. 3. During EvaporationDuring Evaporation • Water turns from a liquid to a gas.Water turns from a liquid to a gas. • Water moves from rivers and lakes into theWater moves from rivers and lakes into the atmosphere in the form of water vapor.atmosphere in the form of water vapor. • Water vapor forms clouds.Water vapor forms clouds. • Water changes into solid.Water changes into solid.
  4. 4. Factors InfluencingFactors Influencing EvaporationEvaporation • Wind speedWind speed: the higher the wind speed, the: the higher the wind speed, the more evaporationmore evaporation • TemperatureTemperature: the higher the temperature, the: the higher the temperature, the more evaporationmore evaporation • HumidityHumidity: the lower the humidity, the more: the lower the humidity, the more evaporationevaporation
  5. 5. Fog – Clouds On TheFog – Clouds On The GroundGround There is absolutely no difference betweenThere is absolutely no difference between fog, and clouds found high in the air. Fogfog, and clouds found high in the air. Fog is simply a cloud that has formed near theis simply a cloud that has formed near the surface of the Earth. There are four mainsurface of the Earth. There are four main types of fog, radiation fog, advection fog,types of fog, radiation fog, advection fog, upslope fog, and evaporation fog.upslope fog, and evaporation fog.
  6. 6. How does evaporation causeHow does evaporation cause cooling?cooling? • In an open vessel the liquid keeps onIn an open vessel the liquid keeps on evaporating. The particles of liquidevaporating. The particles of liquid absorb heat energy from theabsorb heat energy from the surrounding to regain the energy lost insurrounding to regain the energy lost in the evaporation. This absorption ofthe evaporation. This absorption of energy from the surroundings make theenergy from the surroundings make the liquid cool.liquid cool.
  7. 7. Vaporisation Condensation Liquid Solid Gas SolidificationFusion Sublimation Interconversion of three states of matter
  8. 8. Latent heatLatent heat • When an object is heated, the heat energyWhen an object is heated, the heat energy of the object gets hidden into the contentsof the object gets hidden into the contents of the beaker. This process is known asof the beaker. This process is known as latent heat.latent heat. • To come into the gaseous form, the liquidTo come into the gaseous form, the liquid takes extra heat from the contents of thetakes extra heat from the contents of the beaker in the form of Latent Heat Ofbeaker in the form of Latent Heat Of Vaporisation.Vaporisation.
  9. 9. Cooling of a Deodrant onCooling of a Deodrant on handhand • When perfume is put on our palm, it feelsWhen perfume is put on our palm, it feels cold because the particles of matter gaincold because the particles of matter gain energy from our surroundings or from ourenergy from our surroundings or from our palm and evaporate at a fast rate causingpalm and evaporate at a fast rate causing our palm to feel cold.our palm to feel cold.
  10. 10. Water kept in an earthen potWater kept in an earthen pot • Water kept in an earthen pot becomesWater kept in an earthen pot becomes cool after some time because of the tinycool after some time because of the tiny holes present in the pot, which helps theholes present in the pot, which helps the water to evaporate. And due to this thewater to evaporate. And due to this the water becomes cool in a short period ofwater becomes cool in a short period of time .time .

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