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vacuum |
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| Air rings also control bubble stability using a principle known as the venturi effect, which is a partial vacuum caused by the flow of air over the bubble. Mechanical vacuum devices cause erection by creating a partial vacuum around the penis, which draws blood into the penis, engorging it and expanding it. They scraped paint powder from the limestone and placed the powder in a partial vacuum for a week to let atmospheric carbon dioxide evaporate away. |
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