Kvantmehaanika arvutustes ilmub Plancki konstant h väga tihti läbijagatuna 2π-ga, mistõttu on tähistuse lühendamiseks kasutusele võetud Plancki nurkkonstant ehk taandatud Plancki konstant tähisega h/2π.
In quantum mechanical calculations, Planck's constant h frequently appears divided by 2π; therefore, to simplify notation, the angular Planck constant or reduced Planck constant denoted by h/2π has been introduced.
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