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.
Copyright © 2000 Sizes, Inc. All rights reserved.
Last revised: 15 April 2010.