what is meant by evaporation? what are the factor on which the rate of evaporation depend upon? how does evaporation causes cooling?
Answers
Answer:
Evaporation, the process by which an element or compound transitions from its liquid state to its gaseous state below the temperature at which it boils; in particular, the process by which liquid water enters the atmosphere as water vapour.
Temperature and rate of evaporation are proportional to each other. Surface area: As the surface area increases, the rate of evaporation increases. The surface area and rate of evaporation are proportional to each other. Humidity: The rate of evaporation decreases with an increase in humidity.
Evaporation is a surface phenomenon where any liquid can release its molecules in the air by using the surrounding heat or the heat from the liquid itself. ... It is because the water molecules absorb the heat of our body and convert into gas molecules. The heat lost from our skin makes us feel cooler.
Evaporation is the surface phenomenon in which the particles at the surface gain enough energy to turn into vapour. There is a number of factors that affect the rate of evaporation.
1. Temperature : The rate of evaporation increases in increasing the temperature of the liquid. When the temperature of the liquid is increased by heating it, more particles of the liquid get enough kinetic energy to get into the vapour state. This increases the rate of evaporation.
2. Humidity of Air : When the humidity of air is low then the rate of evaporation is high and water evaporated more readily. The wet clothes dry quickly under the conditions of low humidity of air this is because when the humidity is low, the amount of water vapour present in the air is small.
During evaporation, the liquid particles at the surface get heated and start vibrating at a greater amplitude. These particles move into a gaseous phase as the bond between them and the rest of the liquid breaks. This reduces the average energy possessed by the liquid and thus causes a cooling effect.