The space above the mercury in a simple barometer is called

Torcelian vacuum

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Newton's vacuum

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Archimede's vacuum

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None of these

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Solution

The correct option is A Torcelian vacuum
Torricellian vacuum
The vacuum formed when a long tube, closed at one end and filled with mercury, is inverted into a mercury reservoir so that the open end of the tube is below the surface of the mercury. The pressure inside the Torricellian vacuum is the vapour pressure of mercury, about 103 torr.

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