Re: What is the best way to make denisty accurate?

Density is mass per unit volume, and mass is easy.

"Voluming" something is more difficult, though, especially when the object is 
both small and irregular, like a penny. Usually it's done by water displacement,
and one good way to do it is:

a. Put a beaker of water on the scale and weigh it (or zero the scale).
b. Suspend the object from a thread and dip it into the water; make sure it
   doesn't touch the bottom or sides of the beaker!
c. Read the change in weight measured by the scale. This amount will be equal
   to the difference between the mass of the object and the *mass* of the
   water displaced (pushed aside) by the object.
d. Convert the mass of water displaced to the volume of water displaced by
   using the density of water.
e. The volume of water displaced is the same as the volume of the object.

                                              Dan Berger
                                              MadSci Admin