A litre is one, a gallon is another.
No. Beakers measure liquid volume. Millimeters is not a unit of volume, and especially not a unit of liquid volume. Beakers usually measure in a fraction of a liter, such as a milliliter.
Ancient Greek is the basic unit used to measure liquid. Ancient Greek can change location and epoch.
The same unit as you use to measure any mass. The SI unit for mass is the kilogram.
centilitre
3
unit
120 ml
Liters
Liter
millilitres
There is really no such thing as a "liquid" unit. The unit of measure is for the VOLUME of something. The best unit for measuring the volume of a human bathtub would be the "Litre".
Milliliters. (: