A unit of mass in an absolute system of units devised by Max Planck, about 2.176 51 × 10⁻⁵ gram¹. Symbol, mP. Algebraically, it is
where c = the speed of light, G = Newtonian gravitational constant, and ħ = the reduced Planck's constant.
1. This is the 2010 CODATA value. For the most up-to-date value, see NIST's CODATA pages: http://physics.nist.gov/cgi-bin/cuu/Value?plkm|search_for=Planck+mass
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Last revised: 26 September 2011.