(a set of units based on Planck constant and other fundamental constants)
Planck units are a set of units based upon Planck constant
and other fundamental constants, i.e., one type of natural units.
Some of them, such as Planck length and Planck time
reflect minimal scales regarding the regime of current physical
laws. Others are within the range of everyday units.
tP ≡ √(ℏG/c5)
lP ≡ √(ℏG/c3)
mP ≡ √(ℏc/G)
EP ≡ mPc2
TP ≡ EP/KB
- tP - Planck time (5.39 × 10-44 s).
- lP - Planck length (1.62 × 10-35 cm).
- mP - Planck mass (not small: 2.18 × 10-5 g, but is by some laws the minimum possible mass of a black hole, i.e., a Planck hole).
- EP - Planck energy (not small: 1.9561 × 109 J).
- TP - Planck temperature (not small: 1.41678516 × 1032 K, by some theories the maximum possible temperature, or maximum for which current physical rules apply, sometimes termed absolute hot).
- G - gravitational constant.
- c - speed of light in a vacuum.
- KB - Boltzmann constant.
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