The first modern thermometer, the mercury thermometer with a standardized scale, was invented by Daniel Gabriel Fahrenheit in 1714.

Daniel Gabriel Fahrenheit was the German physicist who invented the 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; 32 degrees was the freezing point of water and 212 degrees was its boiling point. Zero degrees 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 degrees on the Fahrenheit scale, but it has since been adjusted to 98.6 degrees.

His time period (1686-1736)

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