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10 March 2022

19 April 2021

23 March 2019

  • 17:1517:15, 23 March 2019 diff hist +83 Lifting gas→‎Helium: Tweaked the statement about helium’s diffusion issue compared to hydrogen; it has a worse problem with diffusion and this is important when comparing the gases for use in lifting applications. Also, the use of a semicolon was inconsistent with other listing mechanics following, so it was replaced by a period. Tags: Mobile edit Mobile web edit

6 December 2008