History of Vacuum
The vacuum was discovered by Italian physicist and mathematician Evangelista Torricelli. During his experiments in 1641, he noticed that the last mercury level inside the tube remained at an altitude of 760mm, placing the tube filled with mercury in the same way as 1 meter high mercury, so that the lower part of the tube would come up. The fact that the tube remains in the tube even though the mouth is open but the entire mercury remains in the container and remains at 760mm, the mercury pressure is balanced by the open air pressure. Thus, the first barometer was discovered. He called this system he was using as a barometer. According to the Torricelli barometer, sea level atmospheric pressure was determined as 760mmHg, or 760 torr (the first four letters of its name). It is widely used today.