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Weight Density and Mass Density

  1. Dec 2, 2008 #1
    1. The problem statement, all variables and given/known data
    I measured the weight(in Newtons), mass(in Kilograms), and volume(in cubic meters) of some objects. Then I tried to calculate the mass density and the weight density of the objects.

    2. Relevant equations
    Weight Density = weight/volume

    Mass Density = mass/volume

    ex. weight density of object one ... 2.00 N / 2.55x10-5 m3 = 78431 ??
    mass density of object one ... .204kg / 2.55x10-5 m3 = 8000 ??
    3. The attempt at a solution

    I have found my numeric answers but i do not know what units the weight density and mass density are measured in. Would the weight density be measured in newtons/ cubic meters and the mass density in kg/ cubic meters?
  2. jcsd
  3. Dec 2, 2008 #2


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    Staff Emeritus
    Science Advisor
    Gold Member

    Yes, those would be the unit's to use. However, you may want to re-check your calculations.
  4. Dec 2, 2008 #3
    I keep getting the same thing on my calculations. Should i round to the right number of significant digits or should i change my calculator from degrees to radians?
  5. Dec 2, 2008 #4

    D H

    Staff: Mentor

    The calculations look fine. Are you hinting about the numbers? It looks to me like the OP was using stainless steel.

    What makes you think that this will make any difference?
  6. Dec 2, 2008 #5


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    Staff Emeritus
    Science Advisor
    Gold Member

    I was referring to the disparity between the weight of the object and the given mass multiplied by g:

    (0.204*9.81)/(2.55*10-5) = 78480
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