The density of the column of liquid force n area m2

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Unformatted text preview: . The density of the column of liquid. Force (N) Area (m2) CHM 25 SP07 LU P = g ·h ·d CHM 25 SP07 LU Slide 8 of 23 Pressure Pressure of air is measured with a BAROMETER (developed by Torricelli in 1643) Pressure Hg rises in tube until force of Hg (down) balances the force of atmosphere (pushing up). P of Hg pushing down related to Hg density column height CHM 25 SP07 LU Slide 10 of 23 CHM 25 SP07 LU Slide 9 of 23 Pressure Column height measures P of atmosphere 1 standard atm = 760 mm Hg = 760 torr = 29.9 inches Hg = about 34 feet of water SI unit is PASCAL, Pa, where 1 atm = 101.325 kPa Slide 11 of 23 CHM 25 SP07 LU Simple Gas Laws Boyle 1662 P 1 V PV = constant Slide 12 of 23 CHM 25 SP07 LU CHM 25 SP07 LU 2 Boyle’ Law s A bicycle pump is a good example of Boyle’ s law. As...
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