Q&A for How to Calculate Fluid Pressure

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  • Question
    What is the pressure due to water at a depth of 7.50 km below sea level?
    Meredith Juncker, PhD
    Scientific Researcher
    Meredith Juncker is a PhD candidate in Biochemistry and Molecular Biology at Louisiana State University Health Sciences Center. Her studies are focused on proteins and neurodegenerative diseases.
    Scientific Researcher
    Expert Answer
    Seawater has a density of about 1000 kg/m^3. You have given the depth (height = 7.50 km or 7500 m), and we know the acceleration due to gravity is 9.81 m/s^2. 1000 kg/m^3 * 7500 m * 9.81 m/s^2 = 7.3 x 10^7 kg/m/s^2 or 7.3 x 10^7 Pa.
  • Question
    How do I calculate fluid pressure water in flowing rivers?
    Community Answer
    P= Density * Gravity * Height. Multiply the density by the gravitational force and then multiply by the height.
  • Question
    Are air- and water-pressure gauges different?
    Community Answer
    Yes, they are different. Air pressure gauges use a Bourdon tube, while water pressure gauges use a media for measurement.
  • Question
    How do I calculate the fluid pressure of a hydraulic system?
    Community Answer
    You can calculate hydraulic system pressure using an equation, which states that pressure in pounds per square inch equals force in pounds times the surface area of a piston in square inches. Obtain the values to make the calculation. You will need to know the force in pounds (F) and surface area of the piston in square inches (A).
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