Final answer:
The standard unit of mass in the metric system is the kilogram (kg). The gram (g) is a smaller unit of mass.
Step-by-step explanation:
The standard unit of mass in the metric system is the kilogram (kg). The kilogram was defined by the International Union of Pure and Applied Chemistry (IUPAC) as the mass of a specific reference object. In May 2019, the definition of the kilogram was changed to be based on precise measurements of fundamental physical constants.
The gram (g) is a smaller unit of mass and is exactly equal to 1/1000 of a kilogram.