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If you only poke ONE hole, the contents will NOT be released as quickly as when poking TWO holes. The second hole allows for air to pressurize the space above the liquid contents.

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Wiki User

13y ago
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AnswerBot

5mo ago

To allow air to flow into the can while you drink out of it, preventing a vacuum from forming and making it easier to pour. The second hole creates a smooth pour by reducing the glugging sound as the liquid flows out.

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Q: Why do you poke two holes in an aluminum can?
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