CHEM 0110 Chapter Notes - Chapter 5: Ideal Gas Law, Combined Gas Law, Blaise Pascal

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15 Nov 2016
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Section 1 gas pressure and its measurement. Pressure: the force exerted per unit area of surface: ex: A coin resting on a table exerts a force, and therefore a pressure, downward on the table as a consequence of gravity. The air above the table exerts an additional pressure on the table: si unit of pressure, kg/(m*s2) is given the name pascal (pa), after the french physicist blaise pascal (1623-1662) Barometer: a device for measuring the pressure of the atmosphere. Manometer: a device that measures the pressure of a gas or liquid in a vessel. Millimeters of mercury (mmhg): a unit pf pressure equal to that exerted by a column of mercury 1 mm high at 0. 00oc: also called the torr [after evangelista torricelli who invented the mercury barometer in 1643] Atmosphere (atm): unit of pressure equal to exactly 760 mmhg: relationship between the pressure p and the height h of a liquid column in a barometer or manometer is.