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In most laboratories, with great difficulty. Mercury is a highly toxic substance and its use is very strictly controlled.

A mercury barometer is simple because the height of the mercury column would be 760 mm (approx 30 inches). Mercury has a density which is around 13.6 times that of water. The next most dense fluid which is readily available (and safe) has a density which is about a tenth as much. For this, you would require a column which was about 7.6 metres (25 feet) tall! That is not a simple piece of equipment.

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