Water Pressure, Gauge Pressure, Blood Pressure & Density of Unknown Fluid - Physics Problems | Summary and Q&A

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November 12, 2017
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Water Pressure, Gauge Pressure, Blood Pressure & Density of Unknown Fluid - Physics Problems

TL;DR

Calculate the difference in water pressure between two points based on height using density, gravitational acceleration, and area.

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Questions & Answers

Q: How do you calculate the difference in water pressure between two points based on height?

The difference in pressure is equal to the density of the fluid times the gravitational acceleration times the difference in height.

Q: How can you convert pressure from kilopascals to millimeters of mercury?

Use the conversion factor of 101.3 kilopascals = 760 millimeters of mercury.

Q: What is the density of blood used in the calculations?

The average density of whole blood is 1060 kilograms per cubic meter.

Q: How does pressure change as you go up or down in height?

Pressure decreases as you go up and increases as you go down in height.

Summary & Key Takeaways

  • Pressure is defined as force over area, and the force is based on the weight of the water above the point.

  • The difference in pressure between two points is equal to the density of the fluid times the gravitational acceleration times the difference in height.

  • To convert pressure from kilopascals to millimeters of mercury, use the conversion factor of 101.3 kilopascals = 760 millimeters of mercury.

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