Noun
English Wikipedia has an article on:Planck energyWikipedia
Planck energy (plural Planck energies)
(physics) A natural unit of energy, equivalent to the mass energy of a Planck particle (
E
P
=
c
2
m
P
≈
1.95608
×
10
9
J
{\displaystyle E_{P}=c^{2}m_{P}\approx 1.95608\times 10^{9}J}
) or the energy per quantum at a temperature of one Planck temperature (kTP).
In quantum theory, distance is inverse to energy, because you need particles of very high energy to probe very short distances. The inverse of the Planck energy is the Planck length. Lee Smolin