How does UDL capacity transform to capacity for unit?

Capacity is volume, SI unit : cubic metre

unit of capacity (a standardised measure by which volume can be expressed)

Your question is too vague, the capacity of what? Capacity of containers can be measured with volume, and units would be liters, quarts, or gallons. Capacity of computer systems is often measured in...

Any unit of volume is a unit of capacity (and vice versa). A few of the popular ones include . . . -- fluid ounce -- milliliter -- cup -- pint -- quart -- liter -- cubic centimeter -- cubic meter --...

Litres