Tap water contains atmospheric gases, such as nitrogen and oxygen, dissolved in it. As the glass filled with water sits out for a few hours, its temperature rises slightly (water gets warmer), which causes the dissolved gases in it to come out of the water and form bubbles along the inside of the glass.

Fill a glass with water (at or below room temperature) and leave it undisturbed for a few hours (you can do this using tap water). You will eventually notice that tiny bubbles begin to appear along the side of the glass (on the inside).

Why does this happen?

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