The metric units of mass are:
Kilogram=mass of 4 videocassettes
Gram=mass of a small paper clip
Milligram=mass of an eyelash
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Length in metric units is usually in meters, centimeters, millimeters, and kilometers but there are other possible metric units of length. Volume in metric units is usually in liters, cubic centimeters or cubic meters but there are other possible metric units of volume. Mass in metric units is usually in kilograms, grams, or metric tons - although there are other possible metric units of mass.
Grams and Kilogarms
kilogram, litre and degree Celsius.
It doesn't make sense to convert between units of length and units of mass.
In the metric system, the units of measurement of Volume is the Liter (sometimes spelled Litre) and the measurement for mass would be the gram. In the American system, the units of measurement for Volume is the ounce, and for mass would be the pound.