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Physical constant

Reduced Planck constant

  • ħ
  • Measured
  • universal

Reduced Planck constant (ħ) is 1.05457182 × 10^-34 J⋅s. h divided by 2π. Exact in principle, shown rounded. Values follow CODATA 2018 (2019 SI redefinition).

Value

Value1.05457182 × 10^-34 J⋅s
Scientific notation1.054571817 × 10^-34 J⋅s
UnitJ⋅s
Symbolħ
ExactnessExperimentally measuredh divided by 2π. Exact in principle, shown rounded.
Reciprocal9.482521568 × 10^33
Order of magnitude10^-34

Multiples

× 22.10914363 × 10^-34
× 101.05457182 × 10^-33
× 1001.05457182 × 10^-32
× 1,0001.05457182 × 10^-31
× 0.55.27285909 × 10^-35
× 0.11.05457182 × 10^-35

Provenance

DatasetCODATA 2018 (2019 SI redefinition)
Categoryuniversal
Why it mattersh divided by 2π. Exact in principle, shown rounded.

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