NSCI 1321 Lecture 8: The Gaseous State Chap 5
26 Dec 2016
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The force exerted per unit area of surface. A barometer is a device for measuring the pressure of the atmosphere. Relationship between the pressure p and the height h of a liquid: g = constant acceleration of gravity (9. 81 m/s2) d = density of the liquid in the manometer. A manometer is a device for measuring the pressure of a gas or liquid in a vessel. The gas pressure in the flask is proportional to the difference in heights between the liquid levels i(cid:374) the (cid:373)a(cid:374)o(cid:373)eter, h. The volume of a sample of gas at constant temperature varies inversely with the applied pressure. At normal atmospheric pressure, the volume of the gas is 100 ml. When pressure is doubled, the volume is halved. When pressure is tripled, the volume decreases to one-third. When a 1. 00-g sample of o2 gas at 0 c is placed in a container at a pressure of 0. 50 atm, it occupies a volume of 1. 40 l.
