You can measure temperature with a heating element by measuring the thermal noise. Not sure what circumstances that would be useful in, though. I can also rem

You can measure temperature with a heating element by measuring the thermal noise. Not sure what circumstances that would be useful in, though. I can also remember a project that used the arm of a galvanometer as a very sensitive balance for weighing tiny masses, too, which is the same sort of idea but the way it worked was to put a feedback loop around the voice coil and measure the current needed to keep it locked in place against the weight of the sample. https://www.erowid.org/archive/rhodium/chemistry/equipment/scale.html https://www.erowid.org/archive/rhodium/chemistry/equipment/s... is a copy of the original article which would probably appear at https://www.scientificamerican.com/id/down-among-the-micrograms/ https://www.scientificamerican.com/id/down-among-the-microgr... if I had access.