Answer: Acre, Meter, Kilometer, etc.
Answer: You need some square unit. The standard SI unit for area is square meter, but you can also use hectars (= 10,000 square meters) or square kilometers.
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.
You would measure that in grams, or milligrams.
centimeter
Metres
I would use meters
Metres
A microgram.
Potatoes are sold by the kilogram.
A thermometer.
distance
Centimeters
kilograms
A football field is measured in yards. The officiallength of one field is 120 yards from goalpost to goalpost.
you would measure it in kilograms
metric unit