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This question already has an answer here:

I'm using a method of electrolysis where the anode and cathode are in close proximity (~0.7mm) and therefore the separate collection of H2 from the cathode is very difficult. Since O2 is paramagnetic and H2 is diamagnetic I was thinking I could use permanent magnets to separate the gases in a specially constructed bubbler.

Is it possible to calculate the required magnetic field strength necessary to perform this separation? If so, can you provide a formula or point me in the right direction where I can read about how to calculate this?

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marked as duplicate by Todd Minehardt, Klaus-Dieter Warzecha, Jannis Andreska, Nicolau Saker Neto, Jan Nov 26 '16 at 22:08

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    $\begingroup$ You would need a very low temperature and a very strong magnet. $\endgroup$ – DHMO Nov 26 '16 at 1:58
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    $\begingroup$ Relevant question $\endgroup$ – Nicolau Saker Neto Nov 26 '16 at 2:18
  • $\begingroup$ That would be about as practical as making gold from mercury in particle accelerators. $\endgroup$ – Ivan Neretin Nov 26 '16 at 6:50
  • $\begingroup$ @DHMO or thousands of steps in a cascade (like the processes used to concentrate uranium isotopes). Hardly cheap or practical even compared to fractional distillation of the liquefied gas. $\endgroup$ – matt_black Nov 26 '16 at 11:31
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    $\begingroup$ All of your comments have been very helpful, and while DHMO's response is qualitatively correct, the relevant question referenced in #2 provided a formula that seems applicable to my situation. Thank you! $\endgroup$ – Eric C. Nov 26 '16 at 15:00