Density is defined as the mass of something divided by the volume of the
same thing.
During a careful reading of the definition, it becomes apparent that density
is not mass, and that density is also similarly not weight as well, either.
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The density is measured by dividing the mass of the substance with it's volume. Density = Mass/Volume.
mass (or weight, which is mass relative to Earth's gravity) and volume. The density unit will be mass (weight) per unit volume. For a very rough example, the density of air in a tire is measured in PSI (pounds per square inch)
What links mass and density is knowing the volume. Density is mass/volume. Mass is essentially weight here on earth, and has the units in grams generally (maybe kilograms depending on how dense) and accordingly, volume may be in cm3 or litres or m3)
To calculate the density, find the mass and the volume. Mass divided by volume = Density. Each substance has a different density. Density is measured in g/cc (solids) or g/ml (liquids).
Mass: is the weight of an object. Volume: is the space inside an object. Density: is how much stuff there is in some ammount of space:3 your welcome