Planck units

E154875
system of natural units

Planck units are a system of natural units in physics where fundamental constants like the speed of light, gravitational constant, and Planck constant are normalized to 1, providing a scale-free framework for describing physical laws.

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All labels observed (6)

Label Occurrences
Planck units canonical 13
Planck unit system 4
Planck units system 2

Statements (53)

Predicate Object
instanceOf system of natural units ⓘ
alsoKnownAs Planck units ⓘ
surface form: Planck system of units

natural units ⓘ
basedOnConstant Boltzmann constant ⓘ
Coulomb constant ⓘ
gravitational constant ⓘ
reduced Planck constant ⓘ
speed of light in vacuum ⓘ
characteristicScaleFor Planck-scale physics ⓘ
quantum gravity effects ⓘ
definedBy Max Planck ⓘ
field cosmology ⓘ
quantum gravity ⓘ
theoretical physics ⓘ
hasBaseQuantity Planck area ⓘ
Planck charge ⓘ
Planck current ⓘ
Planck density ⓘ
Planck energy ⓘ
Planck force ⓘ
Planck impedance ⓘ
Planck length ⓘ
Planck mass ⓘ
Planck momentum ⓘ
Planck power ⓘ
Planck temperature ⓘ
Planck time ⓘ
Planck voltage ⓘ
Planck volume ⓘ
namedAfter Max Planck ⓘ
PlanckChargeApproxValueSI 1.8755459×10⁻¹⁸ coulomb ⓘ
PlanckEnergyApproxValueSI 1.9561×10⁹ joule ⓘ
PlanckLengthApproxValueSI 1.616255×10⁻³⁵ meter ⓘ
PlanckMassApproxValueSI 2.176434×10⁻⁸ kilogram ⓘ
PlanckTemperatureApproxValueSI 1.416784×10³² kelvin ⓘ
PlanckTimeApproxValueSI 5.391247×10⁻⁴⁴ second ⓘ
purpose eliminate arbitrary human-based units ⓘ
provide a scale-free formulation of physical laws ⓘ
simplify fundamental equations of physics ⓘ
setsToOne Boltzmann constant ⓘ
surface form: Boltzmann constant k_B

Coulomb constant 1/(4πϵ₀) ⓘ
gravitational constant G ⓘ
reduced Planck constant ⓘ
surface form: reduced Planck constant ħ

speed of light in vacuum c ⓘ
simplifiesEquation Dirac equation ⓘ
Einstein field equations ⓘ
Einstein field equations ⓘ
surface form: Friedmann equations

Schrödinger equation ⓘ
usedIn high-energy physics ⓘ
loop quantum gravity ⓘ
quantum field theory ⓘ
string theory ⓘ
yearProposed 1899 ⓘ

Referenced by (22)

Full triples — surface form annotated when it differs from this entity's canonical label.

Planck constant → usedToDefine → Planck units ⓘ
Max Planck → knownFor → Planck units ⓘ
Planck time → partOf → Planck units ⓘ
Planck time → isFundamentalUnitIn → Planck units ⓘ
this entity surface form: Planck unit system
Planck length → relatedConcept → Planck units ⓘ
Planck length → introducedInContextOf → Planck units ⓘ
this entity surface form: Max Planck’s natural units
Heaviside–Lorentz units → relatedConcept → Planck units ⓘ
Planck → knownFor → Planck units ⓘ
subject surface form: Max Planck
Planck temperature → relatedTo → Planck units ⓘ
this entity surface form: Planck units system
Planck units → alsoKnownAs → Planck units ⓘ
this entity surface form: Planck system of units
t_P → definedBy → Planck units ⓘ
this entity surface form: Max Planck units system
t_P → belongsTo → Planck units ⓘ
Planck energy → partOfSystem → Planck units ⓘ
Planck energy → introducedInContextOf → Planck units ⓘ
this entity surface form: Planck unit system
Planck mass → partOf → Planck units ⓘ
this entity surface form: Planck units system
Planck mass → introducedInContext → Planck units ⓘ
l_P → field → Planck units ⓘ
subject surface form: Planck length
l_P → partOf → Planck units ⓘ
subject surface form: Planck length
this entity surface form: Planck unit system
l_P → introducedIn → Planck units ⓘ
subject surface form: Planck length
this entity surface form: Planck unit system
Planck scale → relatedConcept → Planck units ⓘ
Planck area → unitSystem → Planck units ⓘ
Planck volume → relatedSystem → Planck units ⓘ