Question

Conversion of water vapour into droplets of water occurs by the process of:
$\left( A \right)$ Evaporation
$\left( B \right)$ Condensation
$\left( C \right)$ Sublimation
$\left( D \right)$ Freezing

Answer 1

Hint: Phases change when the process occurs like sublimation, condensation, freezing, evaporation, transcription etc. Phase is defined as a region in which all the physical properties are almost the same.

Complete step by step answer:
The vapour present in our environment is due to plants or rivers, this process is called transpiration. The molecules of gas are randomly moving in the atmosphere.
The process by which water vapour again forms droplets is due to the process called condensation. The condensation process occurs because the temperature in the high altitude is low, so the change in the phase of water occurs.
 So the answer will be condensation.

Hence, option B is correct.

Additional Information:
 Evaporation is a process in which the surface of liquid is converted into vapours. The molecules in the surface collide with each other and when the molecules absorb enough energy it is able to overcome the vapour pressure thus the liquid changes into vapour.
Sublimation: the process in which solid is converted into vapour state without passing through the liquid phase for example dry ice and solid $C{O_2}$.
Freezing is a process in which the liquid turns into solid, this happens when the temperature downs the freezing point like when the water turns into ice, formation of snow11, solidification of melted candle wax.

Note:
Condensation role play band impact in constructions as it causes dampness, corrosion, wood root, mold health issues. Due to these negative impacts the buildings should have proper ventilation and air conditioning. The amount of water vapour can be increased in the air by increasing the temperature and thus less condensation will occur.