Apparatus used to measure volumes is usually marked in cm 3 or ml. Although these are different units, they describe the same volume. For example, 250 ml = 250 cm 3.

\(concentration~in~g~dm^{-3}=\frac{mass~of~solute~in~g}{volume~in~dm^{3}}\) The units for concentration are also shown as g/dm 3, but this means the same as g dm-3. 8 g of sodium hydroxide is ...