I've been getting intense nighttime reflux — severe pain sometimes keeping me up most of the night sometimes resolved
by cold fluids / chilled fruits (although I have trouble swallowing anything colder than room temp).
The black hole analogue, reported in Nature Physics, was created by trapping sound waves using an
ultra cold fluid.
The rapid milk chiller cools the milk by means of a heat exchange
with cold fluid inside the dome.
Convection current — circular movement created when hot fluids rise and
cold fluids sink.
They even have hollow rolling pins that can be filled with hot or
cold fluids.
The receiver contains an engine known as a Stirling engine that converts heat to mechanical power by compressing
a cold fluid, which could be water or synthetic oil.
Remember: «climate change» claims that
a cold fluid heats its own heat source.