Fahrenheit, Gabriel Daniel (1686–1736)
Gabriel Fahrenheit was a Polish-born German instrument-maker who invented the alcohol thermometer (1709) and the first mercury-in-glass thermometer (1714), and discovered the variation of boiling point with atmospheric pressure, but who is best remembered for his Fahrenheit temperature scale. This has 180 divisions (degrees) between the freezing point of water (32°F) and its boiling point (212°F). Although still commonly used in the United States, elsewhere the Fahrenheit scale has been superceded by the Celsius scale first proposed by Anders Celsius. See also third law of thermodynamics.