The origins of fixed temperature points
When the thermometer was first invented there was no clear understanding of fixed temperature points.
Temperature
Using a glass thermometer in a laboratory setting
Although many variations of a thermometer are documented throughout history, the glass thermometer that is most familiar with what we see today was first invented by the Grand Duke of Tuscany, Ferdinand II, in 1654.
Difference between Celsius, Centigrade and Fahrenheit?
The Fahrenheit, Celsius and Centigrade are the most common terms of temperature scales.
Who invented the thermometer?
The first recorded thermometer was produced by the Italian Santorio Santorio (1561-1636) who was one of a group of Venetian scientists working at the end of the 16th century.