a mass is 1200 pieces.
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Mass per Meter Run in Kg
You first need to find out what the pieces are. 12 mm is a measure of length. Length, by itself cannot be converted to an equivalent mass.
Using a scale, the box of bricks, and the object, keep putting bricks or pieces of bricks until the scales balance. Find out how many bricks you put and multiply by the mass of one brick and you got the mass of the object.
Pieces of candy is plural; how many pieces are in a jar.
Its mass remains the same (except for the very small amounts that stick to the knife blade).