Hi Burr, you need to look up the "density" of the material, the density is a number that gives the weight of the material for a certain unit of volume.
Just pay attention to the units that the density is in and then multiply that number by your volume in the same unit system and that will give you the weight.
So say for example your object has a volume of 33 cubic centimeters.
If you want to get its weight if made of lead, look up the density of lead, which according to wikipedia is 11.34 grams per cubic centimeter.
Now you can multiple 33cc * 11.34 grams/cc and get a value of 374.22 grams as the result.
Just be careful that the units of your volume matches the units that the density number is in.
- Michael
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