Standard atmosphere (unit)
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The standard atmosphere is a unit of pressure defined as 101325 Pa. It is sometimes used as a reference pressure or standard pressure. It is approximately equal to Earth's average atmospheric pressure
Aneroid barometer for household use from c. 1925
Torricelli's experiment
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Torricelli's experiment was invented in Pisa in 1643 by the Italian scientist Evangelista Torricelli. The purpose of his experiment is to prove that the source of "horror of the vacuum" by nature come
Evangelista Torricelli. Line engraving by P. Anichinius. Wellcome V0005861
Demonstration of Torricelli pump at Questacon
Water is coloured with potassium permanganate for easy visualization.
Tube from the bucket is pulled up to the third floor of the building and the point where the liquid ceases to rise observed.