page_title: Planck constant
hierarchical_section_title: Planck constant
context_page_description: The Planck constant links the amount of energy a photon carries with the frequency of its electromagnetic wave. It is named after the physicist Max Planck. It is an important quantity in quantum physics.
  The Planck constant has dimensions of physical action: energy multiplied by time, or momentum multiplied by distance. In SI units, the Planck constant is expressed in joule seconds or or.
  The symbols are defined here.
  In SI Units the Planck constant is exactly 6.62607004×10⁻³⁴ J·s. Scientists have used this quantity to calculate measurements like the Planck length and the Planck time.
context_section_description: The Planck constant (Planck's constant) links  the amount of energy a photon carries with the frequency of its electromagnetic wave. It is named after the physicist Max Planck.  It is an important quantity in quantum physics.
  The Planck constant has dimensions of physical action: energy multiplied by time, or momentum multiplied by distance. In SI units, the Planck constant is expressed in joule seconds (J⋅s) or (N⋅m⋅s) or (kg⋅m²⋅s⁻¹).
  The symbols are defined here.
  In SI Units the Planck constant is exactly 6.62607004×10⁻³⁴ J·s (by definition). Scientists have used this quantity to calculate measurements like the Planck length and the Planck time.
caption: A commemoration plaque for Max Planck on his discovery of Planck's constant, in front of Humboldt University, Berlin. English translation: "Max Planck, discoverer of the elementary quantum of action h, taught in this building from 1889 to 1928."
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