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Aishwarya .r .j from SREE CHITHIRA THIRUAL RESIDENTIAL, asked a question
Subject: Science , asked on 21/6/15

evaporation causes cooling explain why

Tanishq Gupta From Lancer's Convent Sr Sec School, added an answer, on 21/5/12
111 helpful votes in Science

 evaporation causes cooling as when a liquid evaporates it absorbs the latent heat of vapourisation from its surroundings to regain the energy lost during evaporation. This absorbtion of energy from the surroundings makes the surroundings cool.

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Gayathri P Kumar From Lake Fd School, added an answer, on 21/5/12
25 helpful votes in Science

during evapourisation, particles of the liquid gain energy from the surroundings to overcome the force of attraction between them. as a result, loss of heat energy occurs in the surroundings. that is why evapourisation causes coolng sensation.

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Vishnu From Kendriya Vidyalaya, added an answer, on 12/5/16
5 helpful votes in Science
In an open vessel , the liquid keeps on evaporating . The particles of liquid absorb energy from the surroundings to regain the energy lost during evaporation . This absorption of energy from the surroundings make the surroundings cold.
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Krishnan Unni From Kulapati Munshi Bhavans Vidya Mandir, added an answer, on 21/5/12
1589 helpful votes in Science

Evaporation is one of the four principal ways that heat can be transferred (the other three are radiation, convection, and conduction). Evaporation of sweat from the skin is an endothermic reaction: the reaction essentially "consumes" heat, which cools the body in the process.

For a liquid to turn into gas, either by boiling or evaporation, energy is required. This is known as the latent heat of vapourisation. In the case of boiling this is provided by external heat sources but in the case of evaporation it has to come from within the liquid itself, thus cooling it.

The energy is required to break the strong bonds between the molecules in the liquid and allow them to break free in gaseous form.
Evaporation is an endothermic (heat-absorbing) process because molecules must be supplied with energy to overcome the intermolecular forces.

Evaporation occurs at the surface of a liquid, and energy is required to release the molecules from the liquid into the gas. The use of this energy, known as latent heat, causes the temperature of the liquid to fall

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Anuvinda Murali From The Model School, added an answer, on 21/5/12
421 helpful votes in Science

Evaporation causes cooling.

For instance, take a example of earthern pot, now you will wonder how water in the earthern pot is cool throught. How do this happen?

Ans. Earthern pots contains small pores on their surface. which helps in the evaporation and by evaporation the heat is absorbed and the water in the pot remains cool.

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Sankha Subra Ghosh From Cbse, added an answer, on 22/5/12
19 helpful votes in Science

Due to evaporation only high energy particles live the surface. this result in decrease of averagekinetic energy of the particles in the system . Kinetic energy is related to tempreture. As result there is a dropin tempreture of the system. Thus, evaporation cause cooling.

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Pratyush Dhiman From Mind Tree School, added an answer, on 21/5/12
1 helpful votes in Science

Evaporation is one of the four principal ways that heat can be transferred. Evaporation of sweat from the skin is an endothermic reaction: the reaction essentially "consumes" heat, which cools the body in the process.


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Parv Ashwani From Vibgyor High Internayional, added an answer, on 4/5/16
5 helpful votes in Science
Evaporation causes cooling when the "heat of evaporation" is positive. This is defined as the heat taken up by the phase transition from liquid to vapor. For water, the heat of evaporation is unusually large, so it take away so much heat, the surface it evaporates from is significantly cooled.
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Aarush From Air Force Bal Bharati School, added an answer, on 11/6/16
When the water gets evaporated using the energy present in the surrounding it drcrease the forces of attraction and cause the water to cool.
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Mounica Gangavaram From St Vincent Pallotti School, added an answer, on 21/5/12
35 helpful votes in Science

evaporation is an enndothermic process i.e., the liquid absorbs heat evapouration. this heat may be provided by liquid itself or by the surroundings. on evapouration, the liquid takes heat from the surroundings. on evaporation, the liquid takes place from the other parts of the liquid, thereby cooling down. on the other hand, if the liquid takes place from the surrouindings, it causes the cooling of the surrouindings.

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Manmohan Singh From Delhi Public School, added an answer, on 25/9/16
69 unhelpful votes in Science
hvngb
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Lakshita From Delhi Public School, added an answer, on 13/6/15
3 helpful votes in Science
It is because the water absorbs heat and evaporates by leaving the surface cool. PLZ HIT LIKE 👍 IF U LIKE MY ANSWER
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Rishav From St.joseph's Secondry High School, added an answer, on 7/6/14
9 helpful votes in Science

This is because the latent heat of vapourisation required by the subsyance to evaporate absorbs it from the substance that is in contact with it .also evaporation absorbs around 2,488 joules of heat.

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Lohit Samotra From Amity International School, added an answer, on 29/5/12
1 unhelpful votes in Science

because the latent heat of vapourisation required by the subsyance to evaporate absorbs it from the substance that is in  contact with it .also evaporation absorbs around 2,488 joules of heat

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Alina Ahmed , added an answer, on 21/5/12
2 unhelpful votes in Science

Liquid and Vapor

  • Liquid evaporating from a surface has a cooling effect. And different liquids have this effect to different degrees. For example, rubbing alcohol has more of an evaporative cooling effect than does water. Alcohol is what is called a volatile liquid, meaning simply that it evaporates comparatively more quickly than water. But regardless of the liquid, the principle of evaporative cooling is the same. The idea is that in its liquid state, the substance---whether water or alcohol---has a certain heat content. Critical to this are two of the three basic phases of matter: liquid and vapor. (The solid phase is, of course, the third.)

Heat

  • When a liquid evaporates, its molecules convert from the liquid phase to the vapor phase and escape from the surface. What drives this process is heat. In order for the molecule to leave the liquid surface and escape as a vapor, it must take heat energy with it. The heat that it takes with it comes from the surface from which it evaporated. Since the molecule is taking heat with it as it's leaving, this has a cooling effect on the surface left behind.



Read more: How Does Evaporation Cause Cooling? | eHow.com http://www.ehow.com/how-does_5315235_evaporation-cause-cooling.html#ixzz1vWOoPvzn

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Saket Agrawal , added an answer, on 28/10/14
1 unhelpful votes in Science
because it is surface phenomenon so when the sun rays come on surface of water then its surface get heated and evaporates and the lower layer of water will be cool
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Ayush Chaudhary From Chinmaya Vidyalaya, added an answer, on 14/5/15
1 unhelpful votes in Science
Every action has a equal and opposite reaction.
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Suneet Prakash From Dav Public School, added an answer, on 3/6/15
1 unhelpful votes in Science
f uck offf
 
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