You would typically use liters or gallons to measure the volume of a hot tub.
The basic unit of volume is the cubic metre. In everyday use, the litre is more common.
You would use liters (L) to measure the volume of a soda container in the metric system.
You don't use a unit of mass to measure a volume. Mass and volume are two different things. Mass is measured in kilograms. The main unit of volume in the SI is the cubic meter, but for a kettle, the liter (= cubic decimeter, or 1/1000 of a cubic meter) can be used instead.
There is no unit of measure, and no mechanical device, that can describe or measure both mass and volume.
Liter
You would use Volume.
mililiters
milliliter
millilitres
mililiter
you would use centimetres to measure the volume for a slice of bread
You would typically use liters or gallons to measure the volume of a hot tub.
Mass divided by Volume!!
Litres.
The basic unit of volume is the cubic metre. In everyday use, the litre is more common.
I suggest you use liters.