In physics, the Planck mass (mₚ) is the unit of mass in the system of natural units called Planck Units. it is approximately 21 micrograms. Unlike other units such as Planck length, Planck mass is not a fundamental lower or upper bound. One Planck mass is roughly the mass of a flea egg. It is defined as :
Otherwise; mₚ = Eₚ/c²
mₚ ≅ 21.76470 × 10⁻⁶ gm = 21.76470 µg
Equivalently, the Planck mass is defined such that the gravitational potential energy between two masses of separation 'r' is equal to the energy of a photon of angular wavelength 'r'. That is the ratio equals one.
E= (G×mₚ) / r = (h×c) / r
Isolating mₚ,
mₚ = √((h×c)/G)
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