What metal or nonmetal used in thermometer for measuring of room temperature?

Answer 1

All materials conduct heat. The question is how WELL they conduct heat. Most metals conduct heat better than most metalloids, which in turn conduct heat better than most non-metals. Those are just general trends however. As an example diamond - which is a form of carbon - has a higher thermal conductivity than many metals, but carbon is usually classified as a non-metal (although occasionally as a metalloid depending on the classification scheme). Graphite, another form of pure carbon only has about one tenth the thermal conductivity of diamond - so clearly it's not only the material but also the allotropic form of the material.

Answer 2

Yes, I believe so.

I have seen and use non-metal (Alcohol) mostly used around the house to measure ambient temperature, the metallic (Mercury) often used for lab and medical purposes, and . . . metalloid .. . not sure about this one, but I am thinking of the thermometers that have a dial and a needle that points to the current termperature. They are used in labs and meat thermometers.