Physical constant

Planck constant

Planck constant (h) is 6.62607015 × 10^-34 J⋅Hz⁻¹. Exact since 2019; it now defines the kilogram. Values follow CODATA 2018 (2019 SI redefinition).

Value

Value6.62607015 × 10^-34 J⋅Hz⁻¹

Scientific notation6.62607015 × 10^-34 J⋅Hz⁻¹

UnitJ⋅Hz⁻¹

Symbolh

ExactnessExact by definitionExact since 2019; it now defines the kilogram.

Reciprocal1.50919018 × 10^33

Order of magnitude10^-34

× 21.32521403 × 10^-33

× 106.62607015 × 10^-33

× 1006.62607015 × 10^-32

× 1,0006.62607015 × 10^-31

× 0.53.31303508 × 10^-34

× 0.16.62607015 × 10^-35

DatasetCODATA 2018 (2019 SI redefinition)

Categoryuniversal

Why it mattersExact since 2019; it now defines the kilogram.

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