For rigid polyurethane, I've seen 1.05 g/cm3 published on the web, which would be about 65 lb/ft3. For flexible poyurethane foam, it varies with how much air is in the foam.
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The density of golfball is less then density of water
Density
Density = mass/volumeMass = (density) x (volume)Volume = mass/density
density = mass/volume If you know density and mass, you can calculate the volume by manipulating the density equation such that volume = mass/density. Example: density = 3.57g/cm3 mass = 2.4g volume = ? volume = mass/density = 2.4g/3.57g/cm3 = 0.67cm3
The formula for calculating density is as follows: density = mass/volume. Simply put, if you divide an object's mass by its volume, you will find its density. Density is the mass of an object per unit volume.