The appropriate unit is grams.
You must first decide WHAT you want to measure about the potatoes - their diameter, circumference, mass, volume, etc. To buy or sell potatoes, the mass (commonly called "weight") is most relevant.
Those are two different things. Mass of a sugar packet . . . gram might be best. Capacity or volume of a sugar packet . . . cubic centimeter might be best.
345 mm is a measure of length. A measure of density would have units of mass divided by volume.
weight mass and water and led
The mass would not change, only the numbers describing the amount of mass would change.
gram
grams which unit would you use to measure the mass of a mouse
Do to its size, the mass of a peanut would probably best be measured in grams.
A balance is the best tool for measuring mass.
kilograms or lbs
the best way to measure mass is using grams
Grams or ounces would probably be the best choices.
Put the bug on a sensitive scale.
mass of a substance or an object
Gram.
Grams would work best for weighing a slice of bread.
You would use the unit of measure called "kilograms" to measure the mass of an elephant.