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Kelvin (K)

• Kelvin (K) is the SI unit of thermodynamic temperature.
  
  
• It is also referred to as the absolute temperature and hence has no degrees.
  
  
• The lowest point on the Kelvin scale is absolute zero, the theoretical state of zero thermal energy.
  
  Only 10^-3 K has been achieved
  
  
• The melting point of ice at atmospheric pressure (101325 Pa) is 273.15 K or 0^oC.
  
  Hence K = 273.15 + C
  
  
• Another defining point on the Kelvin scale is water's triple point temperature of 273.16 K (0.01^oC), where at a pressure of 611 Pa (well below atmospheric pressure) water coexists in all of its phases (solid/ice, liquid/water and gas/steam/vapour) in equilibrium with each other.