The question was how much the mass would change, and when weighing the fiber all together then pulling it apart and weighing it again, the mass stayed the same.
We measured the fiber in the beaker before and the scale read 2.76, after pulling the fiber into smaller pieces and putting it back in the beaker, the scale still read 2.76. Many other groups got close to or no change, also. The close groups had somehow made a small error.
If all the groups got that there was no change in mass, and nothing new was added to the system, the mass has to stay constant. When your system is closed, meaning not letting anything enter or leave it, no matter if the matter changes state, the mass stays the same. This idea is also known as the Law of Conservation of Mass.
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