Curious Kids Every Day: A Daily Educational Podcast · Curious Kids Every Day

Why Does Liquid Stay in a Straw?

March 15, 2026·11 min·1 clip

Josh explains that the straw trick shows how air pressure can beat gravity, then quizzes listeners about vacuum, air pressure, and gravity preferences.

Host Josh explains the science behind why liquid stays in a straw when you cover the top with your finger, breaking down how air pressure and gravity interact to create this common phenomenon. He walks through the concepts of vacuum, air pressure differentials, and how sealing the straw creates conditions where air pressure can temporarily overcome gravity.

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