J.G. O'Hara (1993). George Johnstone Stoney and the Conceptual Discovery of the Electron, Occasional Papers in Science and Technology, Royal Dublin Society 8, 5–28. due to Stoney using the approximated value of 1018 for the number of molecules presented in one cubic millimetre of gas at standard temperature and pressure. Using the modern values for the Avogadro constant and for the volume of a gram-molecule under these conditions of , the modern value is , instead of Stoney's 1018.
