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Absolute zero is defined tae be −273.15°C, or 0 K.

Absolute zero is the lawest temperatur possible. Mair formally, it is the temperatur at which entropy reaches its minimum value. The laws o thermodynamics state that absolute zero cannae be reached uisin anly thermodynamic means. A seestem at absolute zero still possesses quantum mechanical zero-pynt energy, the energy o its grund state. The kinetic energy o the ground state cannae be removed.

The zero pynt o ony thermodynamic temperatur scale, such as Kelvin or Rankine scale, is set at absolute zero. Bi internaitional agreement, absolute zero is defined as 0K on the Kelvin scale an as −273.15° on the Celsius scale.[1][2] This equates tae −459.67° on the Fahrenheit scale[3] an 0 R on the Rankine scale.[2] Scientists hae achieved temperaturs extremely close tae absolute zero, whaur matter exhibits quantum effects such as superconductivity an superfluidity.


  1. "Unit of thermodynamic temperature (kelvin)". SI Brochure, 8th edition. Bureau International des Poids et Mesures. 13 March 2010 1967. pp. Section  Check date values in: |date= (help) Note: The triple point of water is 0.01 °C, not 0 °C; thus 0 K is −273.15 °C, not −273.16 °C.
  2. 2.0 2.1 Arora, C. P. (2001). Thermodynamics. Tata McGraw-Hill. p. Table 2.4 page 43. ISBN 0-07-462014-2. 
  3. Zielinski, Sarah (1 January 2008). "Absolute Zero". Smithsonian Institution. Retrieved 2012-01-26.