However, the Fahrenheit scale is still used as the official temperature scale in a number of countries, including the United States as well as its unincorporated territories , the Bahamas, Belize, the Cayman Islands, and a few others. It is defined based on the SI unit of temperature, the kelvin. The Celsius and Kelvin scales are precisely related, with a one-degree change in Celsius being equal to a one degree-change in kelvin.
The kelvin and thus Celsius is defined based on the Boltzmann constant, k, which equals 1. Celsius as a unit and a scale was not widely used until this original definition was inverted. The Celsius temperature range was originally defined by setting zero as the temperature at which water froze.
Zero degrees C was later redefined as the temperature at which ice melts. The other point at which Celsius was set — degrees Celsius — was defined as the boiling point of water. Since its definition, the Celsius scale has been redefined to peg it to Kelvin.
Zero degrees Celsius is now defined as As one degree Celsius is equal to one Kelvin, boiling point of water is equal to In the Fahrenheit scale, water freezes at 32 degrees, and boils at degrees. Boiling and freezing point are therefore degrees apart. Normal body temperature is considered to be Absolute zero is defined as The Celsius scale is nowadays set in such a way that Zero degrees C is the temperature at which ice melts note : not the temperature at which it freezes, which is different!
At the other end of the scale, degrees Celsius is the boiling point of water. The scientific definition of Celsius is now defined against degrees Kelvin. Zero degrees Celsius is One degree Celsius is equal to one Kelvin, so we can say that the boiling point of water is equal to
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