sob
metric unit
Liters would be easiest to use.
distance
You would use millimeters for the measure of the capacity of a paper cup.
Probably none because a stream does not have a capacity but a rate of flow.
There is only one metric system. The relevant units, within that system would be millimetres.
What metric unit would you use to measure a computer keyboard
To measure pop cans in Canada, we use mililitres (ml)
Centimeters
Probably in grams.
mL
The mass of any coin is typically measured in grams; the capacity or volume would be measured in millilitres.