Editing Hall-effect thruster (section)

==== Comparison of noble gasses ====
{| class="wikitable sortable wide"
|+ Noble gas properties and cost comparison table
|-
! Gas !! Symbol !! at wt (g/mol) !! ionization potential (eV) <ref name="lenntech" /> !! unit mass per ionization energy 
! reference price<ref>{{Cite web|title=Chemical elements by market price|url=http://www.leonland.de/elements_by_price/en/list|access-date=17 September 2023|language=en}} Using the Reference Price column, as the cost per unit weight values are inconsistent. The table provides dates that appear to be when quotes were obtained, but has links only to generic supplier websites.</ref>
! cost / m³ (€) !! density (g/l) !! cost / kg (€) !! relative to cheapest
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| [[Xenon]] || Xe || 131.29 || 12.13 || 10.824 || 25 € / l || 25000 || 5.894 || 4241.60 || 1905
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| [[Krypton]] || Kr || 83.798 || 14.00 || 5.986 || 3 € / l || 3000 || 3.749 || 800.21 || 359
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| [[Argon]] || Ar || 39.95 || 15.81 || 2.527 || $0.12 / ft³ || 3.97 || 1.784 || 2.23 || 1
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| [[Neon]] || Ne || 20.18 || 21.64 || 0.933 || € 504 / m³ || 504 || 0.9002 || 559.88 || 251
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| [[Helium]] || He || 4.002 || 24.59 || 0.163 || $7.21 / m³ || 6.76 || 0.1786 || 37.84 || 17
|}