This would be called an ion. Tch.
The difference between the two students that we know of is that they used a different meter stick. So the difference would be best attributed to the different tools they used.
Note, this is quite a huge difference. It's likely that one of the sticks, or both, are quite defect.
Scientists often perform experiments to check and recheck their work. They also redo these experiments to ensure correct results.
It’s the remains of a dead organism
