A kilogram.
The gram.
In the SI - the current metric system - that would be the kilogram. In older metric systems, the gram has been used as the unit of mass.
The kilogram is the official unit of mass.
Carat IS a metric unit of mass
The gram.
kilograms
The metric standard unit of mass is the kilogram (Kg).
Grams.
The kilogram.
Kilogram
The gram.
The basic metric unit of mass is the gram (g).
The gram is a unit of mass in the metric system.
Pounds.
The SI unit for mass in the metric system is the kilogram.
The basic unit of mass in the metric system is the gram.
Grams. Matter is measured by mass and mass's main unit is grams.