by Brianna on September 22nd, 2008

Brianna

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How do you measure mass and volume?

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  • by krazymike on September 22nd, 2008

    krazymike

    Mass (on earth) = its weight
    Volume = Amount of water it displaces.
    Weigh the object for mass. Fill a graduated cylinder with x mL of water. Submerge the object. Observe the new water level (y mL). y - x = object's volume

    Comments
    • What if I want to measure the volume of the big sphere in Epcot Center in Florida.. do I need to get a crane to dunk it in water? Wouldn't it have to be air tight? This sounds like a big job!

      Just kidding :-) Good answer for smallish objects. For larger, non-dunkable objects, you have to do some calculation, which, depending on the shape, may be fairly complex.

      yeroco

      by yeroco on September 22nd, 2008

    • There are formulas for nearly every shape:
      http://www.math.com/tables/geometry/volumes.htm

      krazymike

      by krazymike on September 22nd, 2008

    • If I were to ask you what the volume of a Toyota Prius is, would you be able to calculate it accurately using just those shapes? It would take an enormous number of those shapes to come within a percent of the real answer, I suspect. The real world is pretty complex.

      yeroco

      by yeroco on September 22nd, 2008

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