Tap water appears cloudy sometimes and then clears up because it contains microscopic, pressurized air bubbles that escape and rise to the surface. When water travels through municipal distribution mains or private pressure tanks under high pressure, it dissolves a large volume of air. The moment you open your faucet, the pressure drops instantly, forcing the dissolved air out of solution as tiny bubbles that create a milky appearance. As these air pockets naturally float upward into the atmosphere, the water clears completely. Verification: Pour the water into a clear glass and watch the haziness vanish progressively from the bottom up.
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