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This was forwarded from chem list-serv; I thought we physics folks would be equally interested in it.
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-FORWARDED MESSAGE:
1. A query from a science teacher:
I am an 8th grade science teacher, and we recently did an activity in which the students collected temperature data as they heated ice to go through phase changes. As expected, they had plateaus for melting and boiling points, but one group in particular had a mystery that we can't yet solve.
At one lab station, the "boiling point" was much higher than any other station. In each class, the plateau was around 112 degrees C, while most other station recorded boiling points around 101 or 102 C. Our first guess was that the thermometer they were using (a simple glass/alcohol one) was not calibrated properly,