What is meant by the term absorption.

Explanation

**Step-by-Step Solution:**

1. **Definition of Absorption**: Absorption is a process where one substance (the absorbate) is taken up by another substance (the absorbent) and accumulates within its bulk.

2. **Distinction from Adsorption**: It is important to differentiate absorption from adsorption. In absorption, the foreign molecules penetrate into the bulk of the absorbent, whereas in adsorption, the molecules adhere to the surface of the absorbent.

3. **Example of Absorption**: A common example of absorption is the interaction between water and calcium chloride. Calcium chloride can absorb water from the environment, leading to the formation of a hydrated compound.

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