Week-6.pdf

# Mercury seal p 1 0 p 2 m h height column kpa gh p gh

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mercury seal P 1 = 0 P 2 m h height column kPa gh P gh P gh P 760 . 0 ~ 101 0 2 1

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Other Units of Pressure Blood Pressure: (Systolic/Diastolic 110/70) Units: millimetres of mercury (mmHg, or torr) Pa gh mmHg 8 . 132 ) 001 . 0 )( 8 . 9 )( 13580 ( 1 P 1 P 2 h = 1mm Mercury ( ρ = 13580 kg/m 3 )
Other Units of Pressure Blood Pressure: (Systolic/Diastolic 110/70) Units: millimetres of mercury (mmHg, or torr) Meteorology: Units: bar/millibar Lung pressure: (MIP/MEP) Units: centimetres of water (cmH 2 O) Pa bar 5 10 1 Pa millibar 2 10 1 Pa mmHg 8 . 132 1 Pa O cmH 98 1 2

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Respiratory Pressure Measured in cmH 2 O Pa O cmH 98 1 2
Summary of Pressure Units Pressure Unit at Atmospheric Pressure Pascals: (Pa = N/m 2 ) (101.3 kPa) Atmospheres: (atm) (1 atm) Blood press.: (mmHg, torr) (760 mmHg) You may see these too, but ones above are most commonly used in 1080 problems Lung press.: (cmH 2 O) (1033 cmH 2 O) Pounds/inch 2 : (psi or lb/in 2 ) (14.7 psi) Meteorology: (bar) (1.013 bar) Meteorology: (millibar) (1013 mbar)

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Practice for Unit Conversion A student’s Maximum Exhalation Pressure is found to be 130 cmH 2 O. An equivalent way of expressing this pressure is: A. 7.94 atm B. 128 kPa C. 1.30 lb/in 2 D. 95.6 mmHg E. 1.28 mbar
Example: Drinking Rum Through a Straw When sucking hard, can reduce gauge pressure in lungs to -80 mmHg. Rum has a density 0.92x10 3 kg/m 3 . What is the max height that rum can be sucked up a straw? To lungs (and tummy) d

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32 P lungs = -80 mmHg = - ρ gh = -(13580 kg/m 3 )(9.8 m/s 2 )(0.08 m) = - 10662 Pa = P1, on diagram 1) Gauge pressure in lungs (convert to Pa) 2) Gauge pressure at P2 P1 P2 P3 Same pressure as at P3 (no height diff.) P2 = P3 = atmospheric pressure Gauge pressure = 0 Pa d
33 d 3) Pressure difference across Rum in straw 4) How high up the straw ( d ) does Δ P push the rum? P1 P2 P3 Δ P = P2 P1 = (0 Pa) ( 10662 Pa) = 10662 Pa Δ P = ρ gh 10662 Pa = (920 kg/m 3 )(9.8)(d) d = 1.18 m
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• Winter '12
• MikeMassa

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