nThe most common scale is the Celsius, though in the United States the Fahrenheit scale is common. Both of these scales use the freezing point and boiling point of
water at atmospheric
pressure as fixed points. On the Celsius
scale, the freezing point of water corresponds to 0°C and the boiling point of water corresponds to 100°C.
nOn the Fahrenheit scale, the freezing point of water is defined to be 32°F and the boiling point 212°F.
It is easy to convert between
these two scales by remembering
that 0°C = 32°F and that 5°C
= 9°F. The Kelvin
scale is based upon absolute zero (-273.15 °C),
or 0 K.