You would use the metric unit "liters" to measure the capacity of a hot water tank.
In the US, a fish tank's capacity is measured in gallons.
Gallons
Liter
You use litres to measure the capacity of a car's gas tank.
Cubic meters are the best unit to measure the capacity of a shark tank because volume measurements like cubic meters can accurately represent the three-dimensional space inside the tank. Square meters measure area, not volume, and would not provide an accurate representation of the tank's capacity.
Litersy a litterlitresLiterliterYou use litres
you would use gallons to measure the capacity of a bathtub
Litersy a litterlitresLiterliterYou use litres
Litres
Milliliters.
you would use gallons to measure the capacity of a bathtub