Unit Definition (feet [France]) A foot (plural: feet) is a non-SI unit of distance or length, measuring around a third of a metre. There are twelve inches in one foot and three feet in one yard.
Unit Definition (X unit) The X-unit (symbol xu) is a unit of length formerly used to measure the wavelength of X-rays and gamma rays. The X-unit is approximately 1.0021×10-13 metre. Defined by the Swedish physicist Karl Manne Georg Siegbahn (1886-1978) in 1925, the X-unit could not at that time be measured directly; the definition was instead made in terms of the spacing between planes of the calcite crystals used in the measuring apparatus.
To link to this page, copy the following code to your site.
Promote this page with a popular social bookmarking service [?]:
If you want to promote this page and share it with others on the web, we've made it easy for you to do.
Below you'll see icons (links) to various bookmarking services. These sites - commonly called 'social bookmark' or 'social news' sites - have large communities of web users who share and rate interesting, useful and important things on the web.
Clicking the links will automatically add the address of this page to the selected sites, letting you share it with others. Each site will ask you to register to share petitions and comments. Registration is free and once a member, you can store and recommend this page and others like it that may help others.
So please select a bookmarking service from the icons below if you wish to share this page with others.
Length/Distance 
Convert from feet [France] to X unit
