In science, Daniel Fahrenheit (1686-1736) was a Polish-born German physicist noted for his circa 1720 invention of the mercury thermometer. In prior alcohol thermometers, the variability in alcohol’s purity made it difficult to obtain reproducible results; the use of mercury by Fahrenheit solved this issue. [1] The Fahrenheit scale, along with the Celsius scale (1742) and the Kelvin scale (1848), is one of the main indicators with which to measure temperature.

References
1. Blumberg, Mark S. (2002). Body Heat: Temperature and Life on Earth (pgs. 18-17). Harvard University Press.

Further reading
● Bolton, Henry Carrington (1900). Evolution of the Thermometer, 1592-1743 (section: "Fahrenheit and the First Reliable Thermometers", pgs. 61-79). The Chemical Publishing Company.

External links
● Daniel Fahrenheit – Wikipedia.