DID YOU KNOW?
that you can divide 1 meter by exactly 10 equal parts
(10 cm x 10 cm x 10 cm)
then make a cube (1000 cm³) of it to fill with water
and you will find that it contains exactly 1 L (1 liter)
(1000 mL) of water
and is the mass of exactly 1 kg (1 kilogram) (1000 g).

1 cm³ (1 cubic centimeter)

filled with water contains exactly
1 mL (1 milliliter)

and is the mass 
of exactly 1 g
(1 gram)