Torricelli

noun

1. E·van·ge·lis·ta [e-vahn-je-lee-stah] /ɛˌvɑn dʒɛˈli stɑ/, 1608–47, Italian physicist.

noun

1. Evangelista (evandʒeˈlista). 1608–47, Italian physicist and mathematician, who discovered the principle of the barometer

1. Italian mathematician and physicist noted for discovering that the atmosphere exerts pressure. He demonstrated that this pressure affected the level of mercury in a tube, thereby inventing the mercury barometer (1643).