A thermometer is a device that measures temperature or a temperature gradient.
Santorio Santorio, a Venetian physiologist, physician, and professor, invented the thermometer in 1612. It was an improved version of Galileo Galilei’s thermsocope. Santorio realised that he could use Galileo’s thermoscope to measure body temperature. He made two important changes that transformed it into the thermometer:
- He made a glass tube into which a patient could breathe. The person’s breath would heat up the air, which would push the water level down inside the measuring tube.
- The second was adding regularly spaced marks, or tick marks, to his device.
Below is a digital reproduction of a portrait of Santorio Santorio:
[ux_image_box img=”1072″ image_width=”40″ link=”https://en.wikipedia.org/wiki/Santorio_Santorio” target=”_blank”]