Final answer:
When a piece of glass is broken into smaller pieces, each piece retains the same mass density if the material is uniform, resulting in equal densities for each piece.
Step-by-step explanation:
The question regards the mass densities of different pieces of broken glass. If a piece of glass is broken into two pieces of different size, assuming that the material is uniform, the mass density of each piece remains the same. Mass density is defined as mass per unit volume, and since the material of the glass has not changed, and there are no mention of any pieces changing their material density due to the breaking process, all pieces should have the same mass density regardless of their size.
Hence, when ranking the mass densities of pieces 1, 2, and 3, if all pieces come from the same glass object and are made of the same material, their mass densities should be ranked as equal. No piece would have a greater or lesser mass density solely based on size.