temperature · International · Modern
SI base unit of thermodynamic temperature. The Boltzmann constant is fixed exactly at 1.380649×10^-23 J/K.
Converter
temperature · International · Modern
degree Celsius
°Cexact
- Record
- M025
- Definition quality
- Standardized
- Conversion mode
- offset
- Calculator
- Fully calculable
Definition
Celsius temperature is defined from thermodynamic temperature by t/°C = T/K - 273.15.
Reference value
K = °C + 273.15
History & use
The Celsius scale shares the same interval size as the kelvin; only the zero point differs.
Modern use
Current-use record in the project inventory; exact scope should follow the definition and regional/system context shown here.
Did you know?
A temperature difference of 1 °C equals a temperature difference of 1 K.
Sources & evidence
Related measurements
temperature · International / Europe · Modern / historical
Fahrenheit temperature converts to Celsius by t°C = (t°F - 32)×5/9; temperature intervals scale by 5/9.