Write one similarity between physisorption and chemisorption.

Explanation

**Step-by-Step Solution:**

1. **Understanding Physisorption and Chemisorption:**
- Physisorption refers to the process where molecules adhere to a surface through weak van der Waals forces. It is generally a reversible process and occurs at low temperatures.
- Chemisorption involves the formation of strong chemical bonds between the adsorbate and the surface. This process is usually irreversible and occurs at higher temperatures.

2. **Identifying Similarities:**
- Both physisorption and chemisorption are processes that involve the adsorption of molecules onto a surface.
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