Liter
There are no units of concentration. Concentration is written as density, which requires a mass measurement, and a volume measurement. The standard units for this is grams per liter.
liters including all prefixes
Many units are used to measure volume; in SI, the basic unit would be cubic meters, since lengths are measured in meters.
SI is a base 10 standardized system
There are 7 basic units
the litre is the standard si unit for volume.
There are , its m3
the si system of measurement is the standard set of units accepted throughout the world.
SI stands (in French) for Système international d'unités, the International System of Units [of measurement].
Meter, gram, liter, (density is a ratio [mas/volume]), second, and it depends on what you're measuring.
The SI units are as follows: Mass: kilogram Volume: cubic meter