Question

Paheli asked for a glass of water from Boojho. He gave her a glass of ice-cold water. Paheli observed some water droplets on the outer surface of the glass and asked Boojho how these droplets of water were formed. Which of the following should be Boojho’s answer?

• A. Evaporation of water from the glass.
• B. Water that seeped out from the glass.
• C. Evaporation of atmospheric water vapour.
• D. Condensation of atmospheric water vapour.

Answer 1

The correct option is D

Condensation of atmospheric water vapour.

The explanation for the correct option :

Option (D): Condensation of atmospheric water vapor.

• Condensation is known as the change of the state of matter from the gas phase into the liquid phase and which is the reverse of the process of vaporization.
• This is the process by which water vapor in the air is transformed into liquid water.
• The reason we see water droplets on the outer surface of a glass containing ice water can be explained by the fact that when we keep the glass of cold water outside the cold freezer, the water vapor contained in the air comes into contact with the glass containing frozen water.
• Therefore the vapor of the atmosphere loses its energy to the cold water and gets converted to water droplets, which we get to see on the outer surface of the glass.
• This phenomenon has been explained on the basis of Condensation of atmospheric water vapor.

The explanation for the incorrect option :

Option (A): Evaporation of water from the glass.

• Evaporation of water from the glass does not explain the observed water droplets on the outer surface of the glass.
• Hence, the given option is the incorrect one.

Option (B): Water that seeped out from the glass.

• The observed water droplets on the outer surface of the glass cannot be explained by stating that it is the Water that seeped out from the glass.
• Thus, the given option does not correspond to the correct concept. are

Option (C): Evaporation of atmospheric water vapor.

• Condensation of atmospheric water vapor does not explain the observed water droplets on the outer surface of the glass
• Thus, the given option does not coincide with the correct concept.

Thus, Boojho’s answer should be that the given phenomenon happened due to the Condensation of atmospheric water vapor.