To convert the volume from milliliters (ml) to cubic millimeters (mm³), you can use the conversion factor that 1 ml is equal to 1000 mm³.
Given that a sugar cube has a volume of about 4.9 ml:
\[ 4.9 \text{ ml} \times 1000 \text{ mm}^3/\text{ml} = 4900 \text{ mm}^3 \]
So, the total volume of the sugar cube is 4900 mm³.