it depends on what your measuring if you want mass use grams if you want weight use Newtons or pounds if you want vollume use liters or pints ect. but for what i think your doing you would use either milliliters or centameters
Metres
Potatoes are sold by the kilogram.
To measure the mm of an item you would need to use a metric ruler. The metric ruler has cm and mm on it.
centimeter
You would measure that in grams, or milligrams.
Milliliters or fluid ounces would be reasonable metric units to measure the capacity of a drinking glass. These units are commonly used for measuring liquid volumes and would provide a clear indication of the glass's capacity.
Pints
its liters
Milliliters (mL)
To convert liters to metric tonnes, you need to know the density of the liquid. For water, which has a density of 1 kg/L, 5000 liters would weigh 5 metric tonnes. If the liquid is denser, the weight in metric tonnes would be higher.
Of course, how else would you measure how much milk you'd have? You could measure in Imperial gallons, but the metric Litre (or Liter) is also a common way to measure liquid substance (which what milk is, a liquid).
The metric mass unit used to measure the amount of liquid a water bottle holds is typically liters (L) or milliliters (mL). These units indicate the volume of liquid that can be contained in the bottle, rather than the mass of the liquid itself.
You would use a millilitre or, equivalently, a cubic centimetre. A larger unit, which could be used, is a litre.
The metric volume of a sink would be measured in litres.
You would use the metric unit "liters" to measure the capacity of a hot water tank.
That would be the liter.
Metres