Who was the first scientist to determine atmospheric pressure?

The idea of ​​an experiment to measure atmospheric pressure was first proposed by the Italian physicist and mathematician Evangelista Torricelli. The experiment itself was carried out in 1643 by V. Viviani, a student of Galileo. The experiment used a thin glass tube, sealed at one end, a cup and mercury. Mercury was about half filled in the cup and completely in the tube. To prevent mercury from spilling out before immersion in the cup, its unsealed end was tightly closed. After immersing the non-soldered end in mercury, the hole was opened. The tube itself was positioned vertically. Part of the mercury was poured out of the tube and a void (torrichelleva) was formed under the sealed end. Torricelli believed that a column of mercury above the level of mercury in a cup creates a pressure equal to atmospheric pressure. Equal pressure prevents further mercury from pouring out of the tube. If you equip the tube with a scale, you can measure the pressure with the height of the mercury column.