"https://en.wikipedia.org/wiki/Planck_units"^^ . . "Planck Mass"@en . . "planckmass" . . . . "\\(m_P = \\sqrt{\\frac{ \\hbar c^3}{G}} \\approx 1.2209 \\times 10^{19} GeV/c^2 = 2.17651(13) \\times 10^{-8}\\), where \\(c\\) is the speed of light in a vacuum, \\(\\hbar\\) is the reduced Planck's constant, and \\(G\\) is the gravitational constant. The two digits enclosed by parentheses are the estimated standard error associated with the reported numerical value."^^ . "http://dbpedia.org/resource/Planck_mass"^^ . "In physics, the Planck mass, denoted by \\(m_P\\), is the unit of mass in the system of natural units known as Planck units. It is defined so that \\(\\approx 1.2209 \\times 10 GeV/c_0 = 2.17651(13) \\times 10 kg\\), (or \\(21.7651 \\mu g\\)), where \\(c_0\\) is the speed of light in a vacuum, \\(G\\) is the gravitational constant, and \\(\\hbar\\) is the reduced Planck constant. Particle physicists and cosmologists often use the reduced Planck mass, which is \\(\\approx 4.341 \\times 10 kg = 2.435 \\times 10 GeV/c\\). The added factor of \\(1/{\\sqrt{8\\pi}}\\) simplifies a number of equations in general relativity. Quantum effects are typified by the magnitude of Planck's constant."^^ . "\\(m_P\\)"^^ . "2.17644e-08"^^ . "http://en.wikipedia.org/wiki/Planck_mass?oldid=493648632"^^ .