Final answer:
Daniel Gabriel Fahrenheit sealed oil in a glass thermometer and developed the Fahrenheit scale in the 1700s, establishing 32°F as the freezing point of water and 212°F as its boiling point.
Step-by-step explanation:
In the 1700s, the German scientist Daniel Gabriel Fahrenheit sealed oil in a glass thermometer. He used mercury in the thermometer's tube, a concept that was suggested by Ismael Boulliau. The Fahrenheit scale, which he developed in 1724, set the freezing point of water at 32°F and the boiling point at 212°F. However, this scale is known for its arbitrary temperature definitions and is not commonly used for scientific purposes.