When a glass is completely filled with water and flipped upside down, the water doesn't fall because atmospheric pressure outside the glass is greater than the pressure inside, creating a pressure difference that holds the water column in place; however, if air enters the glass, this pressure difference is eliminated and the water falls.
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Upside Down Water Won’t Fall? 💧🤯Añadido:
He fills a glass completely, flips it upside down, and let's go. The water doesn't fall. Gravity is still pulling it down.
So, why isn't it moving? Flipping creates a low-pressure region inside, lower than the air outside. That difference holds the entire water column up.
>> Okay. The moment air sneaks in, it all falls.
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