You might get a vessel of the appropriate size, pour in enough water to cover the object (before you put it in). See what the level is by making a mark on the side.
Insert your ball and see how much water is displaced. Calculate the volume of the displaced water.
Like this ... diameter of vessel is 6 inches.
When you immerse your ball the level goes up 2 inches.
Ergo the increase in volume is expressed by π rē h
Pi = 3.14
r=6/2=3
rsqr=9
H=2
Soooooo the volume of your ball is 3.14 x 9 x 2 = 56.52 cubic inches
Now weigh the sucker. Lets say it is 4 lbs
The density is 4/56.52 = 0.07 lbs/cubic inch.
Now hunt around for a density table .... here is one
Seems this particular ball is magnesium.
I have just provided you with hours of fun!!!
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