evaporation takes place at a specific temperature only
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Evaporation:
It is a surface phenomenon. Let’s consider a bowl filled with water (at room temperature). Since, We've a temperature greater than absolute zero, the molecules of water will be randomly moving. Now, the surface of water in the bowl is open to the atmosphere. We've air molecules in random motion as well. The molecules of water (at the surface) are very likely to collide with the molecules of air. You can say from your intuitive abilities that the molecules of air have more energy as compared to molecules of water because latter is bound by cohesive forces from the molecules just beneath the surface and the air molecules are free of any such constraints.
When the air molecules strike the surface, they are going to impart some energy to the water molecules. If this energy is sufficient enough to change the phase of water molecules, we experience a phenomenon, EVAPORATION.
So, it can (effective collisons occur at any temperature. Uhh... not any... (Scientific Pedantry) except at 0K .
Boiling:
It is a bulk phenomenon. Boiling of water is mainly because of convective heat transfer from the molecules at the bottom of the bowl(We are talking about the same bowl here). The boiling point of water is 100°C.( at 1 atm obviously!) The normal collisions at the surface are not enough to impart energy to the water molecules lying deep beneath. So, here comes the concept of Convection. It is a mode of heat transfer where energy is carried by the moving fluid molecules. Since a large number of water molecules are to be energized , we need to attain a high temperature.(Normal temperatures are not sufficient enough ). The molecules at the bottom get the energy and move upwards , collide and impart energy to adjacent molecule and this process is repeated until the molecules at the surface have enough energy to vapourize!
And, We have Boiling of water!!!
hope this answer helps uhhhhh... plzzz give it a brainliest...
It is a surface phenomenon. Let’s consider a bowl filled with water (at room temperature). Since, We've a temperature greater than absolute zero, the molecules of water will be randomly moving. Now, the surface of water in the bowl is open to the atmosphere. We've air molecules in random motion as well. The molecules of water (at the surface) are very likely to collide with the molecules of air. You can say from your intuitive abilities that the molecules of air have more energy as compared to molecules of water because latter is bound by cohesive forces from the molecules just beneath the surface and the air molecules are free of any such constraints.
When the air molecules strike the surface, they are going to impart some energy to the water molecules. If this energy is sufficient enough to change the phase of water molecules, we experience a phenomenon, EVAPORATION.
So, it can (effective collisons occur at any temperature. Uhh... not any... (Scientific Pedantry) except at 0K .
Boiling:
It is a bulk phenomenon. Boiling of water is mainly because of convective heat transfer from the molecules at the bottom of the bowl(We are talking about the same bowl here). The boiling point of water is 100°C.( at 1 atm obviously!) The normal collisions at the surface are not enough to impart energy to the water molecules lying deep beneath. So, here comes the concept of Convection. It is a mode of heat transfer where energy is carried by the moving fluid molecules. Since a large number of water molecules are to be energized , we need to attain a high temperature.(Normal temperatures are not sufficient enough ). The molecules at the bottom get the energy and move upwards , collide and impart energy to adjacent molecule and this process is repeated until the molecules at the surface have enough energy to vapourize!
And, We have Boiling of water!!!
hope this answer helps uhhhhh... plzzz give it a brainliest...
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