The correct answer is (3) Liquid in gas.
Fog is the part of a colloidal system in which liquid is said to be dispersed in gas. Fog is an example of aerosol in which the dispersed phase is liquid and the dispersion medium is gas.
Fog is a natural atmospheric phenomenon that consists of a suspension of tiny water droplets or ice crystals in the air. It is essentially a colloidal solution, and the classification of fog as a colloidal solution can be explained as follows:
1. Definition of a Colloidal Solution:
A colloidal solution, or colloidal dispersion, consists of tiny particles (dispersed phase) dispersed in a continuous medium (dispersion medium).
2. Composition of Fog:
In the case of fog, the dispersed phase consists of small liquid water droplets or ice crystals, and the dispersion medium is the air.
3. Formation of Fog:
Fog is formed when moist air cools down and the moisture condenses into tiny water droplets or ice crystals. This often occurs when warm, moist air comes into contact with a colder surface or encounters a colder air mass.
4. Colloidal Nature of Fog:
The liquid water droplets or ice crystals in fog are colloidal in nature because they are dispersed in the air (dispersion medium). These droplets are so small that they remain suspended in the air, giving fog its characteristic appearance.
5. Classification:
The classification of fog as a colloidal solution corresponds to the category of liquid (water droplets) in gas (air). The dispersed phase (liquid water droplets) is finely divided and does not settle quickly due to their small size, resulting in the colloidal nature of fog.
In summary, fog is a colloidal solution because it consists of tiny liquid water droplets or ice crystals dispersed in the air. This colloidal nature is a result of the suspension of fine particles in the dispersion medium, and it distinguishes fog from clear air. |
