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You would use the metric unit "liters" to measure the capacity of a hot water tank.
You would use liters (L) to measure the volume of a soda container in the metric system.
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.
You would use the metric unit of grams to measure the mass of a dime. This would give you an accurate measurement of its weight.
You would use milliliters (mL) to measure the capacity of a paper cup.
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
Centimeters
Probably in grams.