SI Fluid Measure

Although there is no official base unit for volume, the conventional unit is the cubic-meter $\left(\text{m}^3\right)$, although the liter $(\text{L})$ is also commonly used for fluids.

There are $1000\text{ L}$ in $1 \text{ m}^3.$
Alternatively, $1 \text{ cm}^3 = 1 \text{ mL}.$ $_\square$

How many $\text{mL}$ are in a cube of side length $4 \text{ cm}?$

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First, the volume is $V=\text{(side length)}^3 = (4 \text{ cm})^3 = 64 \text{ cm}^3.$

Since, $1\text{ cm}^3$ = $1 \text{ mL},$ $64 \text{ cm}^3 = 64\text{ mL}.\ _\square$

There is also an important relationship between these volume units and the mass of water.

The mass of $1 \text{ mL}$ of water is $1 \text{ g}.$ $_\square$