Another name for the X unit, = 1.002 02 × 10⁻¹³ meters. It is named for Karl Manne Georg Siegbahn (1886 – 1978), who proposed the X unit. For the nature and history of the unit, please see the X unit entry.


Sorry. No information on contributors is available for this page.

home | units index | search |  contact drawing of envelope |  contributors | 
help | privacy | terms of use