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Question about formulas in fluids

  1. Apr 23, 2013 #1
    When using bernoullis and momentum, gauge pressure is only used in calculations, any atmospheric pressure is generally omitted, i could understand if, for example, using bernoullis, pressure 1 and pressure 2 were both atmospheric, therefore they would cancel out, but when one pressure is atmospheric and another if different it is still omitted. Why is this?
     
  2. jcsd
  3. Apr 26, 2013 #2

    rude man

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    Because atmospheric pressure can still be subtracted out on both sides of the equation.
    But you can't have it on one siode and not the other.
     
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