°F.= (°C. x 9/5)+32
°F.= 9/5 (°K.-273.16)+32
°C.= 5/9 (°R.-491.67)
C= Celsius or Centigrade
Rankin is the absolute Fahrenheit scale °R.= -459.67°F.
Kelvin is the absolute Celsius scale °K= .273.16 °C.
Celsius vs Centigrade:
Celsius was adopted in place of centigrade, by international agreement in 1948; however, acceptance of the new term has been slow in Europe, and still slower in the United States. Actually, Celsius and centigrade scales differ slightly. The Celsius scale is based on 0° at the triple point of water (.01°C.) and centigrade has 0° at the freezing point of water. For all practical purposes the two terms are interchangeable.