Meters
The standard unit to measure mass is kilograms.
feet
Meters
feet
millimeter
The standard unit to measure mass is kilograms.
feet
The most appropriate metric unit to measure the mass of a concrete block is kilograms (kg).
Meters
feet
millimeter
kilograms
Centimeter
Kilograms are the most appropriate.
Feet
Litres.
The appropriate unit to measure weight is the newton. Now, if it is really the mass you wanted, you could use kilogram or gram.