# What does density tell us?

Dec 22, 2016

The amount of mass per unit volume.

#### Explanation:

Density is a derived unit from two other units: mass and volume.

Density is by definition, the amount of mass per unit volume.

Identified with the formula $\rho = \frac{m}{V}$.
= > where $\rho$ is the density in $\frac{k g}{L}$ OR $\frac{k g}{m} ^ 3$ or any similar units of
measurements ($\frac{g}{m L} , e t c .$), $m$ is the mass of the object in either
$g$ or $k g$, and $V$ is the volume in either $L$ or $m L$ OR ${m}^{3}$ or $c {m}^{3}$.

The mass and volume units determine the unit of measurement your density is in.

Density tells scientists how "heavy" a substance is. If a substance has a higher density, it is heavier. Likewise a lighter density means it is much lighter.

For example, air has a density of approximately $1.225 \frac{k g}{m} ^ 3$.

Helium gas has a very small density compared to air, approximately $0.18 \frac{k g}{m} ^ 3$. Because its density is so low, it floats higher than air.

Sulfur hexafluoride has an incredibly high density, approximately $6.17 \frac{k g}{m} ^ 3$. This high density results in it "sinking".

Hope this helps :)