To clean their spectacles, people often breathe out on glasses to make them wet. Explain why the glasses become wet?
When we breathe out, we exhale carbon dioxide gas along with water vapors. The water vapor, colliding with the surface of the glass, gets condensed due to the glass becoming wet.
As we breathe out, we exhale gases along with water vapor, this is at a higher temperature than the outside atmosphere. The human body maintains a temperature of 37oC. As the glasses on the spectacles are cooler, this creates a temperature difference. Hence, when the water vapor from the breath collides with the cool glasses, it condenses into water droplets (as it loses heat) and makes them wet.
Extra information:
Condensation: The process in which a gas changes into a liquid on cooling is known as condensation. Condensation happens when either the air is cooled to its dew point or it becomes so saturated with water vapor that it cannot hold any more water.
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