Question

Which of the following will be the SI unit to express density?

• A. $m^3/g$
• B. $Kg/m^3$
• C. $m^3$
• D. $K{g}^3/m$

Answer 1

The correct option is B

$Kg/m^3$

1. A material’s density is defined as its mass per unit volume.
2. Density is essentially a measurement of how tightly matter is packed together.
3. Mathematically we can say that,$density=\frac{mass}{volume}$
4. The SI unit of mass is kilogram ( $Kg$) and Volume is $cubicmetre\left(m^3\right)$.
5. Thus, the SI unit of density is $Kg/m^3$, for convenience we use $g/c{m}^3$ for solids, $grampermillilitre(g/ml)$ and for liquids, and $gramperlitre(g/L)$ for gases.

Hence, the correct answer is option B. $Kg/m^3$