Its really easy, you would use kilograms and grams, for measuring mass.
You would use the unit of measure called "kilograms" to measure the mass of an elephant.
You Use Atomic Mass Number
if i were you , i would use kg
Grams
You would use the metric unit "kilograms" to measure the mass of a wardrobe.
You would use grams (g) to measure a flower's mass.
Mass is measured using kilograms.
Milligram: to measure its mass.
Mass is measured in grams.
kl
Fluif ounces
The SI unit for mass is the kilogram (kg)