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Derivation for pressure

  1. May 3, 2006 #1
    I've been asked to derive the pressure at the centre of a star (well show that it is (Gm^2)/(8*pi*R^4).)

    I've worked it through as follows:

    Pressure = force/area


    surface area = 4*pi*R^2

    and then I put the two formulas together but as you can see I only have a 4 on the bottom instead of 8. Have I missed something clearly obvious here?

    Any help would be appreciated.
  2. jcsd
  3. May 4, 2006 #2


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    If you're looking for the pressure at the center of the star why are you using the force and area at the surface of the star?
  4. May 4, 2006 #3
    Because I couldn't think of another way to do it - it seemed logical to me when the equation I had to get has both the radius and mass of the star. Am I totally lost?
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