Definition of Absorption

Absorption refers to the process in which one substance is soaked up or taken in by another substance. It involves the penetration and diffusion of a substance into another substance, resulting in the mixture of the two substances at a molecular or microscopic level.

Key Points:

• Process: Absorption occurs through the transfer of molecules from one substance (the absorptive material) to another substance (the absorbent).
• Mechanism: Absorption can happen by various mechanisms, such as diffusion, osmosis, or active transport.
• Applications: Absorption is a fundamental concept utilized in various fields, including chemistry, biology, physics, and engineering.
• Examples: Examples of absorption include the absorption of water by a sponge, the absorption of nutrients by plants’ roots, or the absorption of gases in chemical reactions.
• Factors: Factors affecting the rate of absorption include concentration gradients, surface area, temperature, pressure, and the nature of the substances involved.
• Contrast to Adsorption: Absorption should not be confused with adsorption, which refers to the adherence of molecules to the surface of a substance rather than penetration into its bulk.