Explain Torricelli's Experiment.
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In 1646 Torricelli described an experiment in which a glass tube about a meter long was sealed at one end, filled with mercury, and then inverted into a dish filled with mercury, as shown below. ... To recognize Torricelli's contributions, some scientists describe pressure in units of "torr," which are defined as follows.
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The experiment uses a simple barometer to measure the pressure of air, filling it with mercury up until 75% of the tube. Any air bubbles in the tube must be removed by inverting several times. After that, a clean mercury is filled once again until the tube is completely full.
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