Planck temperature
UniversalMeasured
= 1.416 784(16) × 1032 K
- Value
- 1.416 784 × 1032 K
- Standard uncertainty
- 1.6 × 1027 K
- Relative uncertainty
- 1.1 × 10−5 (11 parts per million)
- Status
- Measured
- Symbol
- Source
- CODATA 2022 via NIST · NIST entry
Use in a calculation
Plain
LaTeX
Python
# Planck temperature, CODATA 2022 (NIST)
planck_temperature = 1.416784e32 # K, standard uncertainty 1.6e27
# SciPy: scipy.constants.physical_constants['Planck temperature']What it is
The temperature whose thermal energy kT equals the Planck mass energy.
Equations
- definition
How the value changed, 1998–2022
Each point is one CODATA adjustment, plotted as its difference from the 2022 value; the bars show one standard uncertainty (an arrowhead means the bar runs off the chart).
Relative uncertainty
| CODATA | Value (uncertainty) | Relative uncertainty | Change from previous |
|---|---|---|---|
| 2022 | 1.416 784(16) × 1032 | 1.1 × 10−5 | +0.0 σ of 2018 |
| 2018 | 1.416 784(16) × 1032 | 1.1 × 10−5 | −0.7 σ of 2014 |
| 2014 | 1.416 808(33) × 1032 | 2.3 × 10−5 | −0.3 σ of 2010 |
| 2010 | 1.416 833(85) × 1032 | 6.0 × 10−5 | +0.7 σ of 2006 |
| 2006 | 1.416 785(71) × 1032 | 5.0 × 10−5 | −0.0 σ of 2002 |
| 2002 | 1.416 79(11) × 1032 | 7.8 × 10−5 |
“Change from previous” is the shift in the value divided by the standard uncertainty of the previous adjustment. Earlier values are converted into the current unit where NIST changed it (for example J s to J Hz⁻¹).