when was the fahrenheit scale invented
Fahrenheit invented the mercury thermometer in 1714, but it is unknown exactly how many he made. It divided the freezing and boiling points of water into 180 degrees. 32Â°F was the freezing point of water and 212Â°F was the boiling point of water, set by Fahrenheit himself. 0Â°F was based on the temperature of an equal mixture of water, ice, and salt. Fahrenheit based his scale on the temperature of the human body.