· Evangelista Toricelli, Gallileo’s student were inventor of the Barometer. He died in 1647 before improved the used of his invention. One year after, Florin Perier the French scientist, doing the experiment with that tool in Puy-de-Dome step hill (left) Auvergne mountain in French. According the temperature measurement when he get climbed, he saw the fact about Hg water decline, that mean the Barometer could improve about atmosfer pressure were happen in most of the different elevation(source : Willson, M. 1983. Energy. Time-Life Books. Inc)
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