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A student has four pieces of a substance in different shapes and sizes. The student wants to determine the density of the substance. Which of the following procedures would yield the most accurate data?

Fill four beakers with fluids that have different densities. Place a different piece in each beaker and record whether it sinks or floats.
Fill four beakers with fluids that have different densities. Place one of the pieces into each beaker and record whether it sinks or floats. Repeat with the remaining three pieces.
Place the pieces on a mass balance, one at a time and record the mass of each. Submerge the pieces one at a time in a graduated cylinder filled with a volume of water and record the volume change.
Place a beaker on a mass balance and tare the balance. Place the pieces in the beaker and record the mass, then add just enough water to the beaker to cover the pieces and record the volume of added water.

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