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Problem# h2phy1 - Blood Pressure inside the Aorta
The average gauge pressure in the human aorta is about 100 mmHg.
Convert this average blood pressure to pascals.
Convert this average blood pressure to pascals.
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Strategy - the rule "Must have" of Mr.Zhang ®
memorized (1)Atmospheric pressure,(2)Gauge pressure,(3)Absolute pressure. |
| Atmospheric pressure (Pa) |
| Barometer is a measurement tool for measuring air pressure. Barometers measure the current air pressure at a particular location in "inches of mercury" or in "millibars" (mb). |
| How much pressure are you under? Earth's atmosphere is pressing against each square inch of you with a force of 1 kilogram per square centimeter (14.7 pounds per square inch). |
| 1 atm is calculated by formulae pHggh
→ pHg=13.6x10 3 kg/m3
Therefore, 13.6x103 kg/m3x9.8 m/s2x0.76 m.=1.01325x105Nm-2 =1.01325x105Pa = 1 atm |
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1 atm = 760 mmHg = 760 torr = 29.9 in.Hg =101.325 kPa = 14.7 lb/in.2 |
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Gauge pressure (Pg) is the pressure according to the liquid substance only,at the height level point "h", and it can be calculated by the liquid weight. We calculate the gauge pressure with pgh |
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Absolute pressure (P) The difference between absolute pressure and atmospheric pressure is called gauge pressure. |
| P = (Pg) + (Pa) |
| Absolute pressure - Atmospheric pressure = Gauge pressure |
Solution |
| Ans. The average blood pressure is converted to 13.3 kPa |
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| Brake Master Cylinder |
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