Planck Temperature, `T_P` is the unit of temperature in the system of natural units known as Planck units. It serves as the defining unit of the Planck temperature scale. In this scale the magnitude of the Planck temperature (denoted `T_P`) is equal to 1, while that of absolute zero is 0. Other temperatures can be converted to Planck temperature units.  This constant returns the Planck temperature in degrees Kelvin by default.

Notes

This constant, the Planck Temperature, `T_P`, is specified with a standard uncertainty (standard deviation) of 0.000085 x `10^32` K

See Uncertainty of Measurement Results, a discussion provided by NIST of the application of uncertainty to the documented constants.