The Planck mass is the natural unit of mass, denoted by m_P. It is the mass for which the Schwarzschild radius is equal to the Compton length divided by π. In physics, Planck units are physical units of measurement originally proposed by Max Planck. ... Mass is a property of physical objects that, roughly speaking, measures the amount of matter they contain. ... The Schwarzschild radius or gravitational radius is a characteristic radius associated with every mass. ... The Compton wavelength of a particle is given by , where is the Planck constant, is the particles mass and is the speed of light. ...

≈ 1.2209 × 10¹⁹ GeV/c² = 21.76 µg

The 2002 CODATA-recommended value for the Planck mass is 2.176 45(16) × 10^-8 kg, where the part in parentheses indicates the uncertainty in the last digits shown — that is, a value of 21.7645 µg ± 0.0016 µg. A GEV (or Ground Effect Vehicle) is vehicle that takes advantage of the aerodynamic principle of ground effect (or Wing-in-ground). ... ... The gram or gramme, symbol g, is a unit of mass. ... 2002 (MMII) was a common year starting on Tuesday of the Gregorian calendar. ... CODATA (Committee on Data for Science and Technology) was established in 1966 as an interdisciplinary committee of the International Council of Science (ICSU), formerly the International Council of Scientific Unions. ... // Relation between uncertainty, probability and risk In his seminal work Risk, Uncertainty, and Profit, Frank Knight (1921) established the important distinction between risk and uncertainty: … Uncertainty must be taken in a sense radically distinct from the familiar notion of Risk, from which it has never been properly separated. ...

Particle physicists and cosmologists often use the reduced Planck mass, which is Particles erupt from the collision point of two relativistic (100GeV) gold ions in the STAR detector of the Relativistic Heavy Ion Collider. ... Cosmology, as a branch of astrophysics, is the study of the large-scale structure of the universe and is concerned with fundamental questions about its formation and evolution. ...

≈ 4.340 µg.

Adding the 8π simplifies several equations in gravity.

Unlike most of the other Planck units, the Planck mass is on a scale more or less conceivable to humans, as it is roughly the mass of some fleas. // In physics, Planck units are physical units of measurement originally proposed by Max Planck. ... [[{{{diversity_link}}}|Diversity]] {{{diversity}}} Binomial name Homo sapiens Linnaeus, 1758 Trinomial name {{{trinomial}}} Type Species {{{type_species}}} Subspecies Homo sapiens idaltu (extinct) Homo sapiens sapiens [[Image:{{{range_map}}}|{{{range_map_width}}}|]] Synonyms {{{synonyms}}} Homo (genus). ... Families Tungidae - Sticktight and Chigoe fleas (Chiggers) Pulicidae - Common fleas Coptopsyllidae Vermipsyllidae - Carnivore fleas Rhopalopsyllidae - Marsupial fleas Hypsophthalmidae Stephanocircidae Pygiopsyllidae Hystrichopsyllidae - Rat and mouse fleas Leptopsyllidae - Bird and rabbit fleas Ischnopsyllidae - Bat fleas Ceratophyllidae Amphipsyllidae Malacopsyllidae Dolichopsyllidae - Rodent fleas Ctenopsyllidae Flea is the common name for any of the small...

Significance

The Planck mass is the mass of a black hole whose Schwarzschild radius multiplied by π equals its Compton wavelength. The radius of such a black hole is roughly the Planck length, which is believed to be the length scale at which both general relativity and quantum mechanics simultaneously become important. The Schwarzschild radius or gravitational radius is a characteristic radius associated with every mass. ... The Compton wavelength of a particle is given by , where is the Planck constant, is the particles mass and is the speed of light. ... This article may not be written in the formal tone expected of an encyclopedia entry. ...

See also

• Planck unit
• Planck length
• Planck particle
• Orders of magnitude (mass)

// In physics, Planck units are physical units of measurement originally proposed by Max Planck. ... This article may not be written in the formal tone expected of an encyclopedia entry. ... A Planck particle is a hypothetical subatomic particle, defined as a tiny black hole whose Compton wavelength is the same as its Schwarzschild radius. ... Category: ...

External links

• The NIST Reference on Constants, Units, and Uncertainty