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Homework Help: PSI Formula Help

  1. Mar 4, 2007 #1
    If I have a cylinder with water at 50 PSI, is there any way to calculate how much water it would take to raise the pressure to 150 PSI?
  2. jcsd
  3. Mar 4, 2007 #2


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    Gold Member

    Pressure = height x density.
  4. Mar 4, 2007 #3
    Let me add some additional information. This is for a pipeline with roughly 3.6 million pounds of water and 57500 cubic feet of area. The density is just over 1 g/cm3 at 50 PSI. Height will remain constant as will the volume. So by my thinking, I will have to add 3 times the water to increase the density by 3 times and thus the pressure 3 times. But that is contrary to my experiences with raising the PSI of pipelines in this manner.

    Any thoughts?
  5. Mar 4, 2007 #4


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    Homework Helper

    You are thinking of an ideal gas. Water is no such thing. You need a figure for the compessiblity of water.
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