Cold water holds more dissolved gas than warm water—it’s a basic physics fact that sounds like an excuse. If your tap runs particularly cold in winter, you’re basically a mad scientist brewing a batch of “invisible bubble soup.”
When that cold water hits your warmer glass or the indoor air, the gas expands and escapes. It’s the same reason a cold beer foams when you open it, except this isn’t a party, it’s your hydration routine. One surprising fact: water from a well is especially prone to this because it’s deep underground, high-pressure, and loaded with natural gases like nitrogen and oxygen.
Fun experiment: Run your hot water into a clear glass. If it’s perfectly clear while the cold water was foggy, you’ve just caught the conspiracy red-handed. The heat forces the gas out before it even reaches the glass. You’re a water detective now—put that on your résumé.
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