Question

What is the difference between evaporation and boiling ?

Answer 1

Hint: It is the process at which the state of liquid is changed to the gaseous state when there is an increase in temperature and pressure. The most important factor of vaporization is that it takes place only when the substance reaches above its boiling point.

Complete answer:

Evaporation	Boiling
Evaporation is the slow process.	Boiling is a rapid process.
It produces cooling.	It produces heat.
It can only occur using the internal energy of the system.	It can only occur using the external energy of the system.
It takes place from the surface.	It takes place, when the entire liquid boils.
It does not form bubbles while evaporating.	It produces bubbles which rise upwards while boiling.
Factors affecting evaporation include the surface area, temperature, humidity and the wind speed.	Factors affecting boiling point include atmospheric pressure and the impurities.

Additional information: The most important factor of vaporization is that it takes place only when the substance reaches above its boiling point. For Example, water in the vessel starts vaporizing when it reaches temperature above its boiling point. (\[100^\circ C\]). Evaporation takes at any place since the molecules of liquid absorb energy from the surroundings and changes to the gaseous state. For Example, water in the pond or the river evaporates due to extreme heat and sunlight.

Note: Remember that the solids have high cohesive properties so they do not stick to each other, whereas liquids have both cohesive and adhesive properties and gases have weak cohesion properties. For Example – The formation of water droplets on the surface of the leaves during the rainy season is due to the cohesion. The spreading of the water molecules on the surface is due to adhesive.