To clean their spectacles, people often breathe out on glasses to make them wet. Explain why the glasses become wet.

Explanation

To explain why glasses become wet when people breathe out on them, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Exhalation Process**: When a person breathes out, the air that is expelled from their lungs contains not only carbon dioxide but also water vapor.

2. **Water Vapor Release**: During exhalation, the warm air that is exhaled carries water vapor. This is because our breath is warm and can hold moisture.

...