Question

What are the units of density for a liquid usually expressed as?

Answer 1

Hint: Density is the characteristic property of any substance and in general, it is defined as mass per unit volume. For liquids, density can be calculated by dividing the mass of the liquid by its volume taken, and thus density is measured in the units of mass/volume.

Complete answer:
Any substance possesses many characteristic physical and chemical properties and these properties can be described in many ways. Let’s take for example the density of any material. This property indicates how much of the substance occupies a unit volume or a specific volume at a defined temperature and pressure conditions.
It varies from material to material. But it is more frequently discussed in the properties of liquid substances. To be more specific, density is defined as mass per unit volume and its formula can be written as:
$$\text{Density (d)}={\displaystyle \frac{\text{Mass (M)}}{\text{Volume (V)}}}$$
The unit of density will be the same as the unit of mass divided by the unit of volume. The mass and volume are commonly expressed in the units of grams $\left(\text{g}\right)$ and cubic centimeters $\left(\text{c}{\text{m}}^3\right)$ respectively. So, the unit of density will be grams per cubic centimeter $\left(\text{g/c}{\text{m}}^3\right)$.
Along with this, density is also expressed in some other units - $\text{g/mL}$ or $\text{g/L}$.
Hence, the density for a liquid is expressed in the units of $\text{g/c}{\text{m}}^3$ or $\text{g/mL}$ or $\text{g/L}$.

Note:
When an object is placed in water, the object’s relative density determines whether it floats or sinks. If the object has a lower density than water, it will float to the top of the water and when the density of an object is higher than that of water, then it will sink.