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Absorption is a fundamental process in various scientific disciplines, including physics, chemistry, and biology. It refers to the process by which a substance, known as the absorbent, takes in another substance, known as the absorbate. This can occur through different mechanisms, such as physical adsorption, where molecules adhere to a surface without chemical bonding, or chemical absorption, where the absorbate becomes part of the absorbent through a chemical reaction.

In physics, absorption is often discussed in the context of electromagnetic radiation, where it refers to the process by which a material takes in energy from a wave, such as light or sound. This energy is then converted into another form, such as heat or electrical energy. For example, solar panels absorb sunlight and convert it into electrical energy.

In chemistry, absorption can involve the dissolution of one substance into another, such as the absorption of a gas into a liquid. This process is crucial in various industrial applications, including the production of chemicals and the purification of gases.

In biology, absorption is essential for the body's ability to take in nutrients from food and other substances from the environment. This process occurs in the digestive system, where nutrients are absorbed into the bloodstream through the walls of the intestines.

Absorption is a ubiquitous process that plays a crucial role in many natural and artificial systems. Its understanding and manipulation are vital in fields ranging from materials science to medicine.