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
"Helium."
The Big Bang Theory Season 2, Episode 5
- Helium.
- Yes.
The Big Bang Theory Season 9, Episode 23
Helium has
an atomic number of two.
The Big Bang Theory Season 7, Episode 3