Kelvin
The SI base unit of thermodynamic temperature, defined by fixing the Boltzmann constant to k = 1.380649 × 10⁻²³ J/K.
Governing formula
K = °C + 273.15
SI unit
K
In depth
The Kelvin scale is an absolute thermodynamic temperature scale where 0 K is absolute zero. Temperature intervals in Kelvin have the exact same magnitude as degrees Celsius (1 K = 1 °C).
Examples in the real world
Water freezes at 273.15 K (0°C) and boils at 373.15 K (100°C) under standard atmospheric pressure.