Measuring Pressure - Measuring Pressure A barometer this is a device used to measure atmospheric pressure 1 First introduced by Evangelista Torricelli

# Measuring Pressure - Measuring Pressure A barometer this is...

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Measuring Pressure A. barometer - this is a device used to measure atmospheric pressure 1. First introduced by Evangelista Torricelli in early 1600s a. Torricelli wondered why water pumps only raised water up to 34 feet b. He did experiments involving putting mercury in glass tubes, inverting the tube into a dish of mercury and measuring how much the mercury dropped by c. He always got 760 millimeters d. Atmospheric pressure B. manometer 1.used to measure pressure of an enclosed gas sample 2. (a barometer only measures atmospheric pressure ) Units of Pressure A. Millimeters of mercury (mm Hg) (also Torr) B. atmosphere of pressure (atm) C. Pascal - pressure exerted by a force of one newton acting on an area of one

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Unformatted text preview: square meter 1. 101.325 kilopascals = 1 atm = 760 mm Hg = 760 Torr D. Standard Pressure and Temperature (STP) 1. 0 degrees Celsius and 1 atm Charles’s Law: Volume-Temperature Relationship A. If Temperature increases, volume increases 1. Example- hot air balloons B. Explanation: 1. At higher temperatures, gas molecules move faster 2. They collide with the walls of the container more often 3. This increased force causes the walls of the container to expand C. First discovered by Jacques Charles in 1787 1. For every degree Celsius a gas it heated above 0, the volume increases by 1/273...
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• Fall '08
• Young
• pH, Torr, Evangelista Torricelli

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