unit:PER-PlanckMass2

URI: http://qudt.org/vocab/unit/PER-PlanckMass2

Type

Description

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 $\approx 1.2209 \times 10 G e V / c_{0} = 2.17651 (13) \times 10 k g$ , (or $21.7651 μ g$ ), where $c_{0}$ is the speed of light in a vacuum, $G$ is the gravitational constant, and $ℏ$ is the reduced Planck constant. Particle physicists and cosmologists often use the reduced Planck mass, which is $\approx 4.341 \times 10 k g = 2.435 \times 10 G e V / c$ . The added factor of $1 / \sqrt{8 π}$ simplifies a number of equations in general relativity. Quantum effects are typified by the magnitude of Planck's constant.

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Annotations

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dcterms:description

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 G e V / c_{0} = 2.17651 (13) \times 10 k g

, (or

21.7651 μ g

), where

c_{0}

is the speed of light in a vacuum,

G

is the gravitational constant, and

ℏ

is the reduced Planck constant. Particle physicists and cosmologists often use the reduced Planck mass, which is

\approx 4.341 \times 10 k g = 2.435 \times 10 G e V / c

. The added factor of

1 / \sqrt{8 π}

simplifies a number of equations in general relativity. Quantum effects are typified by the magnitude of Planck's constant.

qudt:informativeReference

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View as: CSV

Work in progress

RDF/XML

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