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It allows the milk to pour out smoothly because when the milk pours out, air enters the second hole.

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If you don't punch two holes, the milk trying to get out will be resisted by the pressure of the air trying to get in. They about balance, so nothing will happen.

But with two holes, the milk can do what it likes without interference from the air, and vice versa.

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13y ago
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10y ago

One hole to let milk out and one hole to let air in

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Q: Why do you punch two holes in the lid of a tin of milk?
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