kg is the SI unit for mass
you would use a kilogram
use gram, since kilogram is for larger items
Kilogram is a measure of weight - so you would use it to weight something. You would probably use it for objects that are large enough to make using grams unnecessary.
Potatoes are sold by the kilogram.
The international (SI) unit for mass is the kilogram.
Grams
Kilogram
kilograms
If you mean the unit, that's the kilogram.
Kilogram.
While a kilogram is a unit of mass, it can indirectly be used to measure the volume of a liquid by converting the mass to a volume using the liquid's density. The density of the liquid will determine how much volume is equivalent to a kilogram of that liquid.
The same unit as you use to measure any mass. The SI unit for mass is the kilogram.