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Length/Distance ![](imgs/subleaf.gif.pagespeed.ce.kHfn8CPzTA.gif) | Convert from X unit to zettameter |
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Common Length Conversions![](imgs/subleaf.gif.pagespeed.ce.kHfn8CPzTA.gif) Metric Length Conversions![](imgs/subleaf.gif.pagespeed.ce.kHfn8CPzTA.gif) 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. Unit Definition (zettameter) The zettametre (or zettameter), symbol: Zm, is an SI metric unit of length. 1 zettametre is equal to 1e+21 metres, a very large distance. Not to be confused with a zeptometre.
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