His note [5] links to <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=8F4i9M3y0ew" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=8F4i9M3y0ew</a> which is a demonstration of a siphon in a vacuum, so he&#x27;s covered :)