The conversion between the various temperature scales is: C = (5/9) (F - 32); F = (9/5) C + 32; K = C + 273. 16; and R = F + 459. 67, where C is degrees Celsius, F is degrees Fahrenheit, K is degrees Kelvin, and R is degrees Rankine
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}