In 1648, Florin Périer, at the urging of Blaise Pascal, proved Evangelista Torricelli's theory that barometric observations were caused by the weight of air by measuring the height of a column of mercury at three elevations on Puy de Dôme.
Tahun 1648, Florin Périer, semasa kejayaan Blaise Pascal, membuktikan teori Evangelista Torricelli bahwa pengamatan barometris disebabkan oleh berat udara dengan mengukur tinggi kolom merkuri di tiga ketinggian Puy-de-Dôme.