What harmless phenomenon causes cloudiness that will quickly dissipate if a glass of water is left undisturbed?

Answer

Tiny air bubbles

Cloudiness in water that resembles a suspension of fine particles can often be attributed to tiny air bubbles introduced into the system, frequently following maintenance or pressure changes. This appearance is completely harmless, and the distinguishing characteristic is its transient nature; the cloudiness will resolve itself, and the water will become clear rapidly if the glass is allowed to sit undisturbed. The air naturally escapes the water solution, returning it to its normal state.

What harmless phenomenon causes cloudiness that will quickly dissipate if a glass of water is left undisturbed?
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