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They sink because eventually the helium seeps out of the balloon and then the air has been displaced causing the balloon to now be heavier and sink.I also read that that the rubber balloon will deflate faster because the thin rubber is not an ideal container or as the article said barrier for the helium and that Mylar balloons last longer because of the mere structure of the mylar it holds better.Beautiful Piccy Neil!
Rubber is a bit like a wicker basket where Helium atoms are concerned.
"Balloons are my all time favourite multi coloured inflated balls of rubber fun "Glad to hear it.
H and He are quite small molecules and seep out easily through the rubber, unlike CO2 which will keep a ballon filled for ages. It doesn't float very well though.
Balloons are my all time favourite multi coloured inflated balls of rubber fun and joy !!