It is simply a ratio between two variables. There is no information on what measures the letters represent, nor whether the ratio is a constant or variable (eg between Celsius and Fahrenheit).
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M means 1000 V means 5
An object has a mass, say M It also has a volume, say V A useful relation between the above two is the ratio M/V which is defined as the density of the object. It is the mass of an object whose volume is unity. In solids and liquids, the density remains constant over temperature ranges and pressure ranges. But in gases the density is affected by temperature and pressure.
As size increases, the s/v ratio decreases-- the s/v ratio of a cubic cell 1mm on a side is 6, but the s/v ratio of a cubic cell 3mm on a side is only 2.
mass (m) divided by volume (V) = density (d) m/V = d m = d times V
D= m/v