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It sounds like you had to measure the mass and volume of some steel objects and calculate the density, right?

The errors in measuring mass is usually operator-depndent, such as the balance isn't properly "zeroed", the scale is not calibrated, or you determined the mass of 10 objects and forgot to divide by 10 to find the average mass of just one object. All sources of potential error, but not dependent on the characteristic of the steel objects.

Volume, on the other hand, can be hard to calculate depending on the shape of the object: balls or irregular objects, like bolts, screws, etc. are difficult to determine the volume of, and if your object is hollow, then your volume could be way off.

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