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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.
In simple terms, atmospheric pressure is also the same as air pressure. To imagine clearly, what atmospheric pressure is, simply think of a force in the atmosphere that is applied to a specific area. A barometer is an instrument that measures atmospheric pressure. Atmospheric pressure can be calculated. In 1641, Evangelista Torricelli made an experiment on measuring the atmospheric pressure. On his experiment, he used a tube sealed at one end. Torricelli immersed the tube in a container of mercury.