One US gallon of producer's milk (not skimmed, semi-skimmed, homogenised etc), weighs 10.1 pounds-force in customary measure and 44.5 newton in metric measure.
A metric ton of manganese ore weighs 1,000 kilograms or 2,204.62 pounds.
10 grams is equivalent to 0.01 kilograms in the metric system.
There is no set measurement for this, because it varies from person to person. If you wish to measure it with existing metric units, however, the best option would be centimeters because a meter is much too large, while it is very difficult to come across something that measures in decimeters.
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).
Either grams or kilograms - depending on the size of the potato.
Grams.
One US gallon of producer's milk (not skimmed, semi-skimmed, homogenised etc), weighs 10.1 pounds-force in customary measure and 44.5 newton in metric measure.
1 US gallon = 3.78541178 liters. Only if you mean pure water, then 1000 litres of water weighs 1 metric tonne. 1000 litres of water are 264.172052357 gallons that weigh 1 metric tonne.
CENTIMETERS
As a potato chip is light weight I would use grams and milligrams.
A metric ton weighs 2200 pounds. Also called a "long ton".
An average eraser typically weighs between 5 to 10 grams in the metric system.
A ton weighs 2,000 pounds in the United States.
A ton weighs 1,000 kilograms in the metric system.
A metric ton of manganese ore weighs 1,000 kilograms or 2,204.62 pounds.
Acrocanthosaurus weighed 6.17 metric tons/ 6.8 short tons.