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The Barometer. Evangelista Torricelli became the first scientist to create a sustained vacuum and to discover the principle of a barometer. Torricelli realized that the variation of the height of the mercury from day to day was caused by changes in the atmospheric pressure.
The theory that he was exposed to at the University of Padua was a new theory that was proposed by Nicolaus Copernicus which stated that the Earth and all the other planets revolved around the sun. Also Gaileo's observations with his new telescope made him believe Copernicus's heliocentric theory.