
Not quite accurate.
The Macy's balloons are filled with HELIUM...
The Big Bang Theory Season 4, Episode 24

You see, instead of
using liquid HELIUM...
The Big Bang Theory Season 11, Episode 8

I'm not seeing anyone
using liquid HELIUM vortices like this.
The Big Bang Theory Season 9, Episode 16

the abbreviation for HELIUM.
The Big Bang Theory Season 7, Episode 3