Adsorption finds extensive applications both in research laboratory and in industry. A few applications are discussed below: In preserving vacuum: In Dewar flasks activated charcoal is placed between the walls of the flask so that any gas which enters into the annular space either due to ...

Adsorption involves attracting molecules of adsorbate on surface of the adsorbent. Due to this, energy is released and thus heat of adsorption is negative i.e. adsorption is always exothermic. Further physical adsorption involves weak forces of attraction, heat evolved is less whereas chemical adsorption involves ...

Factors Affecting Adsorption of Gases by Solids: Almost all the solids adsorb gases to some extent. However, the exact amount of a gas adsorbed depends upon a number of factors, as briefly explained below: 1. Nature of surface area of the adsorbent: It is observed that the same gas ...

Positive adsorption: In case of adsorption by solids from the solutions, mostly the solute is adsorbed on the surface of the solid adsorbent so that the concentration of solute on the surface of the adsorbent is greater than in the bulk. This is known as positive ...

Difference between physical adsorption and chemisorption are as following: PHYSICAL ADSORPTION CHEMISORPTIONS The forces operating in these are weak     vander Waal’s forces. The forces operating in these cases are similar to those of a chemical bond. The heat of adsorption are low i.e. about 20 – ...

Adsorption: The phenomenon of attracting and retaining the molecules of a substance on the surface of a liquid or a solid resulting into a higher concentration of the molecules on the surface is called adsorption. The substance thus adsorbed on the surface is called the adsorbate ...