Final answer:
The basic unit of capacity in SI is the liter (L).
Step-by-step explanation:
In the SI (or metric) system, the unit for capacity is the liter (L). The liter is a metric unit of volume and is slightly larger than 1 quart. It is defined as 1/1,000th of a cubic meter. The liter can also be expressed in smaller units such as milliliters (mL) and larger units such as kiloliters (KL).