
You see, instead of
using LIQUID helium...
The Big Bang Theory Season 11, Episode 8

They make up a non-Newtonian fluid
which is LIQUID...
The Big Bang Theory Season 2, Episode 3

Careful, Leonard. Liquid nitrogen,
320 degrees below zero.
The Big Bang Theory Season 1, Episode 5

Well, if we had a freezer, the condensed
LIQUID would cool more quickly
Breaking Bad Season 5, Episode 14

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