CHE 110 Chapter Notes - Chapter 5: Acoustic Resonance, Pressure Measurement, Barometer
Document Summary
The height of the mercury in the column is proportional to the barometric pressure. Measures the gas pressure in the closed system. Pressure is proportional to the difference in height of mercury. The force exerted per unit area of surface. Pressure (p) = (force (f)/area(a)) = (mass x acceleration of gravity)/area = (m x a)/ Si unit of pressure = kg/(mxs ) = pascal (pa) Unit of pressure equal to that exerted by a column of mercury 1 mm high at 0. 00 deg c. A related unit of pressure equal to exactly 760 mmhg. 1 atm = 760 mmhg = 101,325 pa (~101 kpa) The volume of a fixed amount of gas at a constant temperature varies inversely with the applied pressure. Ex: if the gas volume is halved, the gas pressure doubles. The volume of gas varies directly with absolute temperature, when n and p are held constant. Ex: doubling the absolute temperature, doubles the volume.
