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To provide an inert atmosphere, that will not condense.

Helium is the least reactive element.

Helium also has the lowest boiling point of any element at 6K ( -267 o C) .

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lenpollock

Lvl 17
∙ 5y ago
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Tyree Cassin

Lvl 1
∙ 5y ago
Thanks for the answer!

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