You see, instead of
using LIQUID helium...
The Big Bang Theory Season 11, Episode 8
MRS. WOLOWITZ: Holy Moses,
how much LIQUID can be in one tuchus?
The Big Bang Theory Season 4, Episode 5
The world's most boring LIQUID
and the world's most boring vegetable,
The Big Bang Theory Season 10, Episode 13
They make up a non-Newtonian fluid
which is LIQUID...
The Big Bang Theory Season 2, Episode 3
Well, if we had a freezer, the condensed
LIQUID would cool more quickly
Breaking Bad Season 5, Episode 14