Daniel Gabriel Fahrenheit was the German physicist who invented a alcohol thermometer in 1709 and the mercury thermometer in 1714.
In 1724, he introduced the standard temperature scale that bears his name Fahrenheit Scale that was used to record changes in temperature in an accurate fashion.
The Fahrenheit scale divided the freezing and boiling points of water into 180 degrees. 32F was the freezing pint of water and 212F was the boiling point of water.
0F was based on the temperature of an equal mixture of water, ice, and salt. Fahrenheit based his temperature scale on the temperature of the human body.
Originally, the human body temperature was 100 F on the Fahrenheit scale, but it has since been adjusted to 98.6F.

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