Mass
However, if, by 'primary unit', you mean 'base unit', then this is the kilogram not the gram.
A gram is part of the metric system. It is the unit of measure for weight.
Gram is a metric unit used to measure mass. It is equivalent to one thousandth of a kilogram.
Gram is the basic unit of mass in the metric system. It is commonly used to measure the weight of objects and substances.
gram or kilogram
gram
gram
Grams
You would use the metric unit "kilograms" to measure the weight of a sack of peaches.
The gram is a metric unit of mass.
The SI unit of the gram is the measure of mass. It is the basis for the units that measure force (Newton) and work (Joule).
A unit, for measuring mass (or in imprecise language) weight.
A gram would be an appropriate measure for its mass.