torricelli, evangelista

Science Dictionary
Torricelli   (tō'rə-chěl'ē)  Pronunciation Key 
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).
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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