Planck mass

Planck mass (plural Planck masses)

1. (physics) The unit of mass in the system of Planck units, defined as: ${\displaystyle m_{\text{P}}={\sqrt {\frac {\hbar c}{G}}}\approx 2.1765\times 10^{-8}{\mbox{ kg}}}$ 

• Planck particle
• Planck unit