- Planck temperature
The Planck temperature, named after German
physicist Max Planck , is the unit oftemperature , denoted by TP, in the system ofnatural units known asPlanck units . It is one of the Planck units that represent a fundamental limit ofquantum mechanics . The Planck temperature is a temperature approaching which modern science is unable to make predictions due to a lack of a general theory ofquantum 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 ofPlanck time ) of theBig Bang according to currentcosmology .where:
"m"P is the
Planck mass "c" is the
speed of light in a vacuumis the reduced
Planck constant (orDirac's constant ), which can be found by"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 unit sExternal 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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