When was the mercury thermometer invented?
List of Dutch inventions and innovations
Before there was the thermometer, there was the earlier and closely related thermoscope, best described as a thermometer without a temperature scale. A thermoscope only showed the differences in temperatures, for example, it could show something was getting hotter. However, the thermoscope did not measure all the data that a thermometer could, for example an exact temperature in degrees. What can be considered the first modern thermometer, the mercury thermometer with a standardized scale, was invented by German-Dutch scientist Daniel Gabriel Fahrenheit (who had settled in Amsterdam in 1701) in 1714. Fahrenheit invented the first truly accurate thermometer using mercury instead of alcohol and water mixtures. He began constructing his own thermometers in 1714, and it was in these that he used mercury for the first time.
Daniel Gabriel Fahrenheit
A pioneer of exact thermometry, he helped lay the foundations for the era of precision thermometry by inventing the mercury-in-glass thermometer (first practical, accurate thermometer) and Fahrenheit scale (first standardized temperature scale to be widely used). In other words, Fahrenheit's inventions ushered in the first revolution in the history of thermometry (branch of physics concerned with methods of temperature measurement). From the early 1710s until the beginnings of the electronic era, mercury-in-glass thermometers were among the most reliable and accurate thermometers ever invented.