Final answer:
A bimetallic stem thermometer is a device used to measure temperature by utilizing the expansion and contraction of two different metals.
Step-by-step explanation:
In the given question, the student is asked to open a carton and insert a bimetallic stem thermometer. A bimetallic stem thermometer is a device used to measure temperature by utilizing the expansion and contraction of two different metals. As one metal expands or contracts more than the other, it causes the strip in the thermometer to coil or uncoil, which can be observed on the calibrated scale of the thermometer.