Question

On a hot day, Aslam takes a bottle of cold drink from the refrigerator and places it on a table. Within minutes, some drops of water appear on the outer surface of the bottle, as the water drops accumulate, they trickle down the surface of the bottle.
Name the processes of the water cycle that are demonstrated in the events observed by Aslam?

Answer 1

Hint: Try to recall the water cycle. It will help in solving this question.
The state of a substance depends upon temperature and pressure like for example water exists as solid at ${0^ \circ }C$ , as liquid at room temperature and in gaseous state at ${100^ \circ }C$ .

Complete answer:
When a bottle of cold drink from the refrigerator is placed on a table, within minutes, some drops of water appear on the outer surface of the bottle. This is due to condensation.
Condensation is the process involving the change of the physical state of matter from the gas phase into the liquid phase. Condensation is the reverse of evaporation.
Since the bottle was in the refrigerator i.e. in a low temperature and the temperature outside the refrigerator is warmer so the water vapours present in the air collides with the surface of the bottle of cold drink which then condenses into water droplets.
Precipitation is when any product of the condensation of atmospheric water vapour falls under gravitational pull. And when the water droplets on the surface of the bottle become heavy they begin to trickle down and fall on the table.

Note:
Evaporation is a process in which liquid changes into vapours. Evaporation causes cooling as high energy molecules leave the surface and average energy of remaining molecules decreases which results in a drop in temperature of the part of the liquid that is left. Cotton is a good absorber of water, cotton clothes help in absorbing the sweat and exposing it to the atmosphere for easy evaporation during summers.