Question

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

Answer 1

The flow of air out of an organism is known as exhalation. That is the flow of oxygen from the lungs out of the airways and into the natural world of animals as they breathe. Your diaphragm relaxes and goes up into your chest cavity as you breathe out, or exhale. Air rich in carbon dioxide is squeezed out of your lungs and windpipe, then out your nose or mouth, as the gap in your chest cavity shrinks.

Complete answer:
We exhale carbon dioxide gas as well as water vapors when we breathe out. As water vapor collides with the glass's surface, it condenses, causing the glass to become wet. A soft cloth will quickly clean this somewhat damp bottle. People sometimes cough on their spectacles to make them moist in order to clean them. The glasses get damp because the air we exhale is warm and contains water vapors, which condense on the glass surface as water droplets. As a result, the glass surface becomes damp.
Water vapor condenses at spectacles and is present in the gases we exhale. As a result, the glass gets wet with the assistance of a tiny volume of water.

Note:
When you exhale, the lungs return carbon dioxide to the atmosphere. However, the air you exhale includes phosphorus, oxygen, and argon, in addition to carbon dioxide. Your body absorbs moisture as you exhale (breathe out). Each breath you exhale includes a small amount of water in the form of water vapor when your mouth and lungs are wet (the gas form of water). Water requires enough energy to keep the molecules going in order to remain a gas in the form of water vapor.