What is 'occulsion'?

Explanation

### Step-by-Step Text Solution for the Question: What is 'occlusion'?

1. **Definition of Occlusion**: Occlusion refers to the process where a substance, often a gas, is absorbed onto the surface of another material, typically a solid. This phenomenon is particularly important in surface chemistry.

2. **Example of Occlusion**: A common example of occlusion can be seen with acetylene gas (C2H2). When acetylene gas comes into contact with certain metals, it can be absorbed onto the surface of the metal.

3. **Chemical Transformation**: During the occlusion process, the absorbed gas can undergo chemical transformations. For instance, acetylene (C2H2) can be converted into other compounds when it interacts with the metal surface.

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