Calculate, estimate and compare volume of cubes and cuboids using standard units, including cubic centimetres (cm³) and cubic metres (m³), and extending to other units [for example, mm³ and km³]

What this means, in plain words

Capacity is how much a container holds. Volume is how much space something takes up.

Estimating means reaching an answer close enough to be useful, before or instead of calculating it exactly.

Comparing asks which is larger or smaller. Ordering puts several of them in a line from smallest to largest.