Question
Diffentiate between absorption and adsorption.

Answer

Sr. No. Absorption Adsorption
1. Definition It is a process in which any substance (atoms, ions, or molecules) is taken by or absorbed by another substance, especially in the solid or liquid material. The substances like gas, liquids or dissolved solids loosely adhere or stick to the surface of another substance which can be solid or liquid.
2. Type of phenomenon It is a bulk phenomenon. It is a surface phenomenon.
3. Type of process Endothermic process. Exothermic process.
4. Rate of reaction Uniform rate. The reaction rate increases slowly and attains equilibrium.
5. Concentration Do not change its constant throughout the medium. The concentration varies from bulk to the bottom of the absorbent.

6. Temperature effect

No effect of temperature. Works at the lower temperature.
7. Application Cold storage, ice production, turbine inlet cooling, refrigerants, etc. Air conditioning, water purification, synthetic resin, chillers, etc.

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