what are the factors affecting the rate of evaporation?????
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Answers
From Liquid to Gas Without Boiling
Evaporation explains why clothes dry on a clothesline. Evaporation is the process in which a liquid changes to a gas without becoming hot enough to boil. It occurs when individual liquid particles at the exposed surface of the liquid absorb just enough energy to overcome the force of attraction with other liquid particles. If the surface particles are moving in the right direction, they will pull away from the liquid and move into the air. This is illustrated in the Figure below.
Motion of particles causes evaporation
Factors That Affect the Rate of Evaporation
Many factors influence how quickly a liquid evaporates. They include:
temperature of the liquid. A cup of hot water will evaporate more quickly than a cup of cold water.
exposed surface area of the liquid. The same amount of water will evaporate more quickly in a wide shallow bowl than in a tall narrow glass.
presence or absence of other substances in the liquid. Pure water will evaporate more quickly than salt water.
air movement. Clothes on a clothesline will dry more quickly on a windy day than on a still day.
concentration of the evaporating substance in the air. Clothes will dry more quickly when air contains little water vapor.
Evaporative Cooling
Did you ever notice that moving air cools you down when you’re hot and sweaty? For example, if you sit in front of a fan, you feel cooler. That’s because moving air helps to evaporate the sweat on your skin. But why does the evaporation of sweat cool you down? When a liquid such as sweat evaporates, energetic particles on the surface of the liquid escape into the air. After these particles leave, the remaining liquid has less energy, so it is cooler. This is called evaporative cooling.
A fan cools you by evaporating sweat
Q: On a hot day, high humidity makes you feel even hotter. Can you explain why?
A: Humidity is a measure of the amount of water vapor in the air. When humidity is high, sweat evaporates more slowly because there is already a lot of water vapor in the air. The slower evaporation rate reduces the potential for evaporative cooling.
Summary
Evaporation is the process in which a liquid changes to a gas without becoming hot enough to boil. It occurs only at the exposed surface of a liquid.
Many factors affect how quickly a liquid evaporates, including the temperature of the liquid and air movement.
When particles evaporate from the surface of a liquid, the remaining liquid is cooler because it has less energy. This is called evaporative cooling.
Review
Define evaporation, and describe how it occurs.
List four factors that influence the rate of evaporation.
What is evaporative cooling? Why does it happen?
Dorrance mopped the floor and now it is wet. She wants the floor to dry more quickly, so she plugs in an electric fan, aims it at the floor, and turns it on. Do you think this will help the floor dry faster? Why or why not?
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Answer:
factors are:-
1) increase in temp. increase on rate of evaporate ion
2) increase in humidiy decrease in evaporation
3) increase in wind speed increase in evaporation
Explanation:
in 1) as temp. rises heat increase and will lead to increase in evaporation
in 2) humidity is amount of water vapour present in air as air can tolerate only certain amount of water vapours so evaporation decreases
in 3) as when wind speed increases water vapours will travels faster in air and will lead to increase in evaporation