In the middle of an evacuated and sealed at both ends

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In the middle of an evacuated and sealed at both ends of a horizontal tube length of 1 m is the mercury length of 20 cm. If the tube stand upright, the mercury moved a distance of 10 cm. Up to a pressure tube was evacuated?

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Task 20702. Detailed solution with a short recording conditions, laws and formulas used in the decision, the withdrawal of the calculation formula and the answer.
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