I think they seal the tube and then turn the element on which then burns all the oxygen
and leaves you with a vacuum. My guess it's cheaper than a vaccum machine?
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Jimbuktu See? Right here, Mon 5 May 2014, 23:38,
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Except...
Oxygen won't burn by itself (and our atmosphere is only about 20% Oxygen, the rest is mostly Nitrogen, which won't burn either).
There has to be some sort of vacuum machine to remove the gas. I think lighting it up is only to check if a vacuum has been achieved.
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RarelyEvil, Sun 11 May 2014, 9:32,
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