Kelvin
| Formula / Notation | K = °C + 273.15 |
|---|---|
| Also Known As | K (Kelvin), absolute temperature, thermodynamic temperature unit |
What is Kelvin?
The Kelvin (K) is the SI base unit of thermodynamic temperature. Unlike Celsius and Fahrenheit, the Kelvin scale is an absolute temperature scale — it starts at absolute zero (0 K = −273.15°C), the theoretical temperature at which all molecular motion ceases. Named after Lord Kelvin (William Thomson), the Kelvin scale is essential in scientific calculations, particularly in thermodynamics and gas laws.
Formula & Notation
Other Names / Synonyms: K (Kelvin), absolute temperature, thermodynamic temperature unit
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
The Kelvin (K) is the SI base unit of thermodynamic temperature. Unlike Celsius and Fahrenheit, the Kelvin scale is an absolute temperature scale — it starts at absolute zero (0 K = −273.15°C), the theoretical temperature at which all molecular motion ceases. Named after Lord Kelvin (William Thomson), the Kelvin scale is essential in scientific calculations, particularly in thermodynamics and gas laws.
Thermodynamic calculations (ideal gas law PV = nRT requires T in Kelvin). Chemical equilibrium constants (temperature dependence). Spectroscopy (Planck equation, Wien's law). Cryogenics (liquid He: 4.2 K, liquid N₂: 77 K). Astronomy (stellar temperatures). Boltzmann equation (k_B T). Blackbody radia…
Temperature unit — no direct safety concerns. Very low Kelvin temperatures (cryogenic range) involve liquid gases with associated hazards.
The formula or notation for Kelvin is: K = °C + 273.15