Not quite accurate.
The Macy's balloons are filled with HELIUM...
The Big Bang Theory Season 4, Episode 24
You and Sheldon already came up
with your superfluid HELIUM model.
The Big Bang Theory Season 9, Episode 16
I'm not seeing anyone
using liquid HELIUM vortices like this.
The Big Bang Theory Season 9, Episode 16
"Helium."
The Big Bang Theory Season 2, Episode 5