Question

would you use the same cubic units to meusure the volume of a zoo size aquarium as you would for a box of books

Answer 1

Measurements for solids and liquids are different. If you measure the volume of animals inside the aquarium you could use the same, however ounces and fluid ounces are two different measuring units.

If you think of cooking, chefs use dry measuring cups and liquid measuring cups and spoons to measure ingredients.