Question

what is density? what is it unit.

Answer 1

Density is the mass of an object divided by its volume. 
The SI unit of kilogram per cubic metre (kg/m3).
I hope it helps.

Answer 2

The density, of a substance is its mass per unit volume. The symbol most often used for density is ρ, although the Latin letter D can also be used. Mathematically, density is defined as mass divided by volume: ${\displaystyle \rho ={\frac {m}{V}}}$ where ρ is the density, m is the mass, and V is the volume.The SI unit of density is kg/m³.

HOPE IT HELPS

PLEASE MARK ME BRAINLIEST ☺️