Weight divided by volume is density. Usually it is expressed as mass divided by volume. That is why a unit for density will be something like grams/liter, because mass is on the top and volume on the bottom.
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You need to know the local force of gravity and the density of the object.
Divide the weight by the local acceleration due to gravity to convert to mass. Then divide the result by the density to get the volume. If you are in outer space, you have no hope because the local gravity will be 0 and division by 0 is not defined.
Weight divided by volume is known as density. It is a measure of how much mass is contained in a given volume of a substance. The formula to calculate density is density = mass/volume.
Density is weight divided by volume. Measure the weight (with a scale), calculate the volume (which is easy to do if the foam is rectangular in shape - you might even want to cut out a rectangular piece, if your foam has an irregular shape), and divide the weight by the volume.
If the object has a regular shape, like a cube or sphere, its volume can be calculated readily from solid geometry. Weight divided by volume gives density. For an irregular shape, one trick for finding volume is to submerge it in a calibrated container of water. The amount of increase in the volume of the water is the volume of the object. * * * * * Mosttly correct but density = mass/volume not weight/volume. Mass is not the same as weight.
Density is weight divided by volume. Weight is measured with a scale. Volume can be calculated if an object has a regular shape, using basic geometry, but if it has an irregular shape, it can be calculated using a graduated cylinder.
The volume of the object is equal to the difference in weight when submerged in water and when in air, divided by the density of water. Using the formula: Volume = (Weight in air - Weight in water) / Density of water, we have Volume = (10g - 8g) / 1 g/cm^3 = 2 cm^3.
To find the weight when you have density and volume, you can multiply the density by the volume to get the mass, and then multiply the mass by the acceleration due to gravity to get the weight. The formula is weight = density x volume x acceleration due to gravity.