Without specialized equipment, it is impossible to measure a substance's density directly. However, density can be calculated by first weighing and then finding the volume of an item.
Place the item on an accurate scale, and record the mass in grams.
If the item is a regular shape like a cube, volume can be calculated using a mathematical formula. If the item is an irregular shape, it must first be broken down into regular shapes before the volume can be calculated. Record the volume in cubic centimeters.
To find the density of the item, divide the mass by the volume to determine density in units of grams per cubic centimeter.
Density is mass per unit area. Density (rho) is calculated as Mass/Area. For some liquids, it is calculated as Mass/Volume. Density is measure of number of molecules.
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1. Find the volume of your object (if you don't already know this information) Measure the length, width and height of your object (for square or rectangle objects) and multiply all
http://www.ehow.com/how_8267030_calculateobjects...

1. Distinguish between volume and density. Volume (v)  It's the space occupied by an 3dimensional object enclosed by a close boundary. Density (ρ)  It's simply mass/unit volume
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Density is calculated by the mass divided by the volume.
http://wiki.answers.com/Q/How_To_calculate_the_den...
