One of the phenomena happening in the liquids is evaporation. It is a natural phenomenon where a matter changes from its liquid state to its vapour state from the surface by soaking the heat content of the liquid. It is very closely related to vaporization. Hence, students must understand the difference first and then proceed to the part where the factors affecting evaporation are explained. To make it easier for students, Vedantu has designed the ideal concept page using simpler language to explain to students.
After referring to this page while studying this chapter, you will find a proper explanation of the factors influencing the rate of evaporation from the surface of a liquid. This section will name the factors affecting evaporation and help you develop your concept appropriately. You will need this knowledge to study the advanced chapters based on this topic.
Evaporation is the natural process where the molecules of a liquid absorb the residual heat present in the liquid and escape in the form of vapour. There is no need to provide external heat to continue this process. It means that evaporation takes place at any temperature. It is a surface phenomenon.
Here is the list of the factors affecting the rate of evaporation you should ponder upon. This part of the chapter is very crucial as the questions are quite conceptual. To answer the questions, find out how the factors change to affect the rate of evaporation.
The prime factor that determines the rate of evaporation from the surface of a liquid is its temperature. We all know that the temperature determines the amount of heat present in a liquid. The heat determines the kinetic energy of the molecules of the liquid. This energy is used to get rid of the intermolecular forces that bind the molecules together. When temperature increases, the heat increases resulting in higher kinetic energy of the molecules. It means that the molecules from the surface will get more energy to break the shackles of intermolecular forces and become vapour. This is the most important among the factors affecting evaporation.
If you concentrate on this factor, you can easily understand that the bigger the surface area, the higher will be the rate of absorption. When the surface molecules get more exposure, they will try to break the intermolecular forces even more. Consider this simple example. A cloth when folded takes more time to dry. If the area of the cloth is spread on the wire, it will dry quicker than the previous case. This is also the same for evaporation in the liquid surface. When the area of the container is bigger, the rate of evaporation is also higher. This is how the experts simply explain the factors affecting evaporation.
Humidity is the amount of water vapour contained in the surrounding atmosphere. The amount of water vapour that air can hold depends on the temperature of the surrounding. It means that hot air has the capability of carrying more water vapour than colder air. Hence, the amount of moisture contained in air will determine how much more water vapour it can take at that temperature. The higher the humidity, the slower will be the rate of evaporation. If you consider a summer day, you will find that wet clothes dry up faster. On the other hand, clothes take more time to dry on a rainy day as the humidity on that day is higher.
If the day is airy, it will take less time for the clothes to dry. The reason is very simple. The air carrying water vapour passes and dryer air comes in to carry more. It means that a windy day will escalate the rate of evaporation. If there is no wind, the rate will be lower. This is how these examples explain factors affecting evaporation properly in this concept page.
The expert at Vedantu are highly experienced in teaching such concepts to students. They know the exact way to make students understand new concepts by using easy examples. On this concept page, you will find a list of factors affecting evaporation with examples perfectly explained by the experts so that students can easily learn them and score well in the exams. It will also help you revise this part of the chapter very easily before an exam and save a lot of your time.
1. How evaporation differs from vaporization?
When you state the various factors which affect evaporation after studying this concept page, you will find that vaporization is not a surface phenomenon. It only takes place when a liquid reaches its boiling point. Evaporation occurs on the surface and takes place at any temperature.
2. Write two factors which will increase the rate of evaporation.
The higher temperature of a liquid and lower humidity of the surrounding will increase the rate of evaporation on the surface of that liquid.
3. How does evaporation depend on wind speed?
When the wind speed is higher, the rate of evaporation is also high and vice versa. The wind carrying the vapour of the liquid will be replaced by empty wind quicker.