Made by:

Shivansh ; 9-B

IntroductionIntroduction Evaporation is the change of state in a substance from a Evaporation is the change of state in a substance from a

liquid to a gas. In meteorology, the substance we are liquid to a gas. In meteorology, the substance we are concerned about the most is water. For evaporation to concerned about the most is water. For evaporation to take place, energy is required. The energy can come take place, energy is required. The energy can come from any source; the sun, the atmosphere, the earth, or from any source; the sun, the atmosphere, the earth, or objects on the earth such as humans.objects on the earth such as humans.

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 Water moves from rivers and lakes into the atmosphere in the form of water the atmosphere in the form of water vapor.vapor.

• Water vapor forms clouds.Water vapor forms clouds.

• Water changes into solid.Water changes into solid.

Factors Influencing Factors Influencing EvaporationEvaporation

• Wind speedWind speed: the higher the wind speed, : the higher the wind speed, the more evaporationthe more evaporation

• TemperatureTemperature: the higher the : the higher the temperature, the more evaporationtemperature, the more evaporation

• HumidityHumidity: the lower the humidity, the : the lower the humidity, the more evaporation more evaporation

Fog – Clouds On The Fog – Clouds On The Ground Ground

There is absolutely no difference There is absolutely no difference between fog, and clouds found high between fog, and clouds found high in the air. Fog is simply a cloud that in the air. Fog is simply a cloud that has formed near the surface of the has formed near the surface of the Earth. There are four main types of Earth. There are four main types of fog, radiation fog, advection fog, fog, radiation fog, advection fog, upslope fog, and evaporation fog. upslope fog, and evaporation fog.

How does evaporation How does evaporation cause cooling?cause cooling?

• In an open vessel the liquid keeps In an open vessel the liquid keeps on evaporating. The particles of on evaporating. The particles of liquid absorb heat energy from the liquid absorb heat energy from the surrounding to regain the energy surrounding to regain the energy lost in the evaporation. This lost in the evaporation. This absorption of energy from the absorption of energy from the surroundings make the liquid cool.surroundings make the liquid cool.

Vaporisatio

nCondensation

Liquid

Solid Gas

Solid

ifica

tio

n Fusion

Sublimation

Interconversion of three states of matter

Latent heat Latent heat

• When an object is heated, the heat When an object is heated, the heat energy of the object gets hidden into energy of the object gets hidden into the contents of the beaker. This the contents of the beaker. This process is known as latent heat.process is known as latent heat.

• To come into the gaseous form, the To come into the gaseous form, the liquid takes extra heat from the liquid takes extra heat from the contents of the beaker in the form of contents of the beaker in the form of Latent Heat Of Vaporisation.Latent Heat Of Vaporisation.

Cooling of a Deodrant on Cooling of a Deodrant on handhand

• When perfume is put on our palm, it When perfume is put on our palm, it feels cold because the particles of feels cold because the particles of matter gain energy from our matter gain energy from our surroundings or from our palm and surroundings or from our palm and evaporate at a fast rate causing our evaporate at a fast rate causing our palm to feel cold.palm to feel cold.

Water kept in an earthen Water kept in an earthen potpot

• Water kept in an earthen pot Water kept in an earthen pot becomes cool after some time becomes cool after some time because of the tiny holes present in because of the tiny holes present in the pot, which helps the water to the pot, which helps the water to evaporate. And due to this the water evaporate. And due to this the water becomes cool in a short period of becomes cool in a short period of time .time .