|
Answer» Consider the following two examples: - Example 1: When a metal spoon is dipped in milk and taken out, it is observed that a film of milk particles covers the spoon surface.
- Example 2: If a cold water bottle is taken out from the refrigerator and kept on a table for a while, water vapour is seen to condense on the outer surface of the bottle, forming droplets or a film.
- In the above examples, the milk particles or the water molecules from the air get adsorbed on the surface of the spoon and the bottle, respectively.
- Similarly, surfaces of many objects around us are exposed to the atmosphere. Water molecules as well as other gas molecules such as N2 , O2 , from the air form an invisible multimolecular film on these objects. This is known as the phenomenon of adsorption.
|
