
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 correct answer is, "When covered by
LIQUID sufficient to reduce the coefficient...
The Big Bang Theory Season 2, Episode 5

Floating in a warm pool
of LIQUID
The Big Bang Theory Season 12, Episode 19

my original theory that space time
was like a super-cooled LIQUID,
The Big Bang Theory Season 9, Episode 18