well you have to think you would weigh this using grams so the density of a foam block is "Grams per cubic centimeters"
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Foam.
It is the mass of the block divided by its volume.
-5
you weigh the block on a balance get its mass if it is a regular shape block so the volume should be length * weadth * breadth (side * side * side) the density = mass / volume
This density is 0,8 g/cm3.