0460001199

Evangelista Torricelli's (1608-1647) demonstration 1643. It showed that the height of a column of liquid is governed by atmospheric pressure and that the height of the column is directly proportional to the density of the liquid. Water will rise to 9.75m (32 feet) but mercury, which is approximately 13.5 times denser, will only rise to .736m (29 ins). A meter (3 feet) tube is filled with mercury and the open end placed in a dish of mercury. The liquid will fall in the tube until the weight of the column is in equilibrium with atmospheric pressure - .736m (29 ins). From 'The Atmosphere' by Camille Flammarion. (London, 1873).

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Copyright: Irish Photo Archive
Image Size: 6000x5739 / 2.3MB; Scientist Itlaian Science Meteorology Measurement Scientific Instrument
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Evangelista Torricelli's (1608-1647) demonstration 1643. It showed that the height of a column of liquid is governed by atmospheric pressure and that the height of the column is directly proportional to the density of the liquid. Water will rise to 9.75m (32 feet) but mercury, which is approximately 13.5 times denser, will only rise to .736m (29 ins). A meter (3 feet) tube is filled with mercury and the open end placed in a dish of mercury. The liquid will fall in the tube until the weight of the column is in equilibrium with atmospheric pressure - .736m (29 ins). From 'The Atmosphere' by Camille Flammarion. (London, 1873).