Planck temperature

Planck temperature

The Planck temperature, named after German physicist Max Planck, is the unit of temperature, denoted by TP, in the system of natural units known as Planck units. It is one of the Planck units that represent a fundamental limit of quantum mechanics. The Planck temperature is a temperature approaching which modern science is unable to make predictions due to a lack of a general theory of quantum gravity. [Nova: " [http://www.pbs.org/wgbh/nova/zero/hot.html ABSOLUTE HOT] "] It is the temperature of the Universe during the first instant (the first unit of Planck time) of the Big Bang according to current cosmology.

T_P = frac{m_P c^2}{k} = sqrt{frac{hbar c^5}{G k^2 =
1.41679(11) × 1032 K

where:

"m"P is the Planck mass

"c" is the speed of light in a vacuum

hbar is the reduced Planck constant (or Dirac's constant), which can be found by hbar = frac{h}{2pi}

"k" is the Boltzmann constant

"G" is the gravitational constant

The two digits between the parentheses denote the uncertainty (standard deviation) in the last two digits of the value.

See also

* Orders of magnitude (temperature)
* Planck's constant
* Planck units

External links

* [http://physics.nist.gov/cgi-bin/cuu/Value?plktmp NIST reference: Planck temperature]
* [http://www.straightdope.com/classics/a3_347.html What is the opposite of absolute zero?]

Notes


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