Question

what is the function of the glass stem in a thermometer

Answer 1

Answer:

the bulb of the thermometer is the thin glass reservoir that holds the liquid. The bulb is carefully designed to contain a calculated volume of liquid, based upon the length and diameter of the capillary (or stem), as well as the thermal expansion coefficient of the liquid.

Answer 2

A stem, “a glass tube containing a tiny capillary connected to the bulb and enlarged at the bottom into a bulb that is partially filled with a working liquid”. A temperature scale which is basically preset or imprinted on the stem for displaying temperature readings.