kelvin (°K)
rankine (°R)
Kelvin unit (K) is the base unit of temperature. other units Celsius (°C), and Fahrenheit (°F).
Kelvin (symbol: K) = Celsius + 273.15 Celsius (°C) = Kelvin - 273.15
Rankine (°R) = Celsius (°C) × 9/5 + 491.67