Right answer: [tex]D=\frac{M}{V}[/tex]
Every substance, body or material has mass and volume, however the mass of different substances, bodies or materials occupy different volumes.
This is where density appears as a physical characteristic property of matter that establishes a relationship between the mass of a body or substance and the volume it occupies.
In formal words:
Density [tex]D[/tex] is defined as the relationship between the mass [tex]M[/tex] and volume [tex]V[/tex] of a specific substance or material and is expressed in the following equation:
[tex]D=\frac{M}{V}[/tex]
The density is a scalar quantity and according to the International System of Units its unit is [tex]D=\frac{kg}{m^{3}}[/tex]
It should be noted that the density of a body is related to its buoyancy, a substance or body will float on another fluid if its density is lower.
