The atmospheric pressure is the weight of air above the Earth's surface. The atmospheric weighs 1013 mp, 1 amt or 760mmhg. The atmospheric pressure it was inventes for Torricelli was discovered by a physicist and a mathematician Italian. In the 1643 it was discovered, in Florence.
It was discovered that Torricelli took a glass tube about one metre in length and filled witn mercury. Keeping the tube closed with mercury a finger, and introduced invested in a crock with mercury. When removing the finger found that the metal fell into a column whose height was 14 times lower than obtained when conducting the experiment with water. as I knew that mercury was 14 times heavier than water, deduced that boht columns fliud were supported equally counter weight, suspecting that only air was capable of doing such a force.
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