Which of the following phenomenon cannot be exhibited in the class ?

Question

Accepted Answer

The correct option is 3: Fog formation.

Fog formation is a large-scale atmospheric phenomenon that requires specific conditions involving the cooling of a vast air mass below its dew point, typically requiring conditions and space that cannot be easily replicated or maintained within a standard classroom environment. While you can produce a small, localized cloud-like effect in a jar, replicating the natural, sustained process of fog (an atmospheric phenomenon) as an exhibit is impractical due to limitations in controlling temperature, humidity, and volume of air.

The incorrect option is 1: Snow formation.
Although true snow formation requires very cold temperatures and altitude, an analogue of snow (or frost) can be exhibited in the classroom. Experiments involving rapid cooling using dry ice or highly compressed gas can quickly condense and freeze moisture, demonstrating the principle of solid precipitation or deposition.

The incorrect option is 2: Condensation.
Condensation is the process of water vapor turning back into liquid water, and it is very simple to demonstrate in a classroom. For example, placing ice cubes in a glass of water instantly causes water droplets to condense on the exterior surface of the glass, making this phenomenon easy to observe and explain.

The incorrect option is 4: Water formation from ice.
This phenomenon is simply melting, which is a phase change from solid (ice) to liquid (water). It is the simplest to demonstrate, requiring only placing ice at room temperature, making it entirely suitable for classroom exhibition and observation.