&Ctrl;Q File Quit Quit &kcalc;. &Ctrl;Z Edit Undo Go back in the result stack. &Ctrl;&Shift;Z Edit Redo Go forward in the result stack. &Ctrl;X Edit Cut Delete the displayed result and copy it to the clipboard. &Ctrl;C Edit Copy Copy the displayed result to the clipboard. &Ctrl;V Edit Paste Insert the cut or copied result in the display. Constants Mathematics Display Pi, Euler Number or Golder Ratio. Constants Electromagnetism Display Light Speed, Elementary Charge, Impedance of Vacuum, Permeability of Vacuum or Permittivity of Vacuum. Constants Atomic & Nuclear Display Planck's Constant, Elementary Charge or Fine-Structure Constant. Constants Thermodynamics Display Boltzmann Constant, Atomic Mass Unit, Molar Gas Constant, Stefan-Boltzmann Constant or Avogadro's Number. Constants Gravitation Display Constant of Gravitation or Earth Acceleration. Settings Science/Engineering Buttons Display science and engineering buttons. Settings Statistic Buttons Display statistic buttons. Settings Logic Buttons Display logic buttons. Settings Constants Buttons Display constants buttons. Settings Show All Display all buttons available. Settings Hide All Hide all extra buttons and display only standard default buttons. Settings Configure Shortcuts... Configure the keyboard shortcuts used by &kcalc;. Settings Configure &kcalc;... Display the &kcalc; settings dialog. &help.menu.documentation;