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The Newton scale was devised by Isaac Newton. He defined the "zeroth degree of heat" as melting snow and "33 degrees of heat" as boiling water. His scale is thus a precursor of the Celsius scale, being defined by the same temperature references. Thus the unit of this scale, the Newton degree, equals ^{100}⁄_{33}Kelvin conversion or degrees Celsius and has the same zero as the Celsius scale.

Fahrenheit is a thermodynamic temperature scale, where the freezing point of water is 32 degrees Fahrenheit (°F) and the boiling point 212°F (at standard atmospheric pressure). This puts the boiling and freezing points of water exactly 180 degrees apart. Therefore, a degree on the Fahrenheit scale is 1/180 of the interval between the freezing point and the boiling point of water. Absolute zero is defined as -459.67°F.

A temperature difference of 1°F is the equivalent of a temperature difference 0.556°C.