The capacity of a barrel is a measure of volume. The SI unit for volume is the cubic metre. A barrel with a volume of one cubic metre would a big barrel. It could be better to measure it in thousandths oh a cubic metre, a thousandth of a cubic metre is called a litre.
Milliliters or fluid ounces would be reasonable metric units to measure the capacity of a drinking glass. These units are commonly used for measuring liquid volumes and would provide a clear indication of the glass's capacity.
You would use the metric unit "liters" to measure the capacity of a hot water tank.
meters
You would use milliliters (mL) to measure the capacity of a paper cup.
The mass of any coin is typically measured in grams; the capacity or volume would be measured in millilitres.
Milliliters or fluid ounces would be reasonable metric units to measure the capacity of a drinking glass. These units are commonly used for measuring liquid volumes and would provide a clear indication of the glass's capacity.
Milliliters is the metric unit to use for the capacity of a thimble.
You would use the metric unit "liters" to measure the capacity of a hot water tank.
It would be millimetres.
liters
liter
meters
You would use millimeters for the measure of the capacity of a paper cup.
Liters would be easiest to use.
Ounces
Probably none because a stream does not have a capacity but a rate of flow.
You would use milliliters (mL) to measure the capacity of a paper cup.