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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.
Early Life: Evangelista Torricelli, an Italian man, and a physicist by occupation, initially studied at Jesuit schools in Faenza, near Ravenna. He was so good as a Physicist and a Mathematician that he was sent to Rome for further studies under Benedetto Castelliâs direction.