Milli is a prefix in the SI and other systems of units denoting a factor of 10-3, 0.001 or 1/1,000. Adopted in 1795, the prefix comes from the Latin mille, meaning one thousand.

1 Liter (L) equals 1000 milliliters (mL).

We use this for all fluids, not only water.

Algebraic Steps / Dimensional Analysis1 l*1000 ml

1 l=1,000 ml