Solution 10586: Temperature Unit R on the TI-85, TI-86, TI-89 Family, TI-92 Family, and Voyage™ 200 Graphing Calculators.
What unit of temperature does R denote on the TI-85, TI-86, TI-89 family, TI-92 family, and Voyage 200?
R is used to denote Rankine, which is an absolute temperature measurement in English units. Rankine is to Fahrenheit as Kelvin is to Celsius.
1 Rankine= -458.67° FahrenheitPlease see the appropriate model of graphing calculator guidebooks for additional information.