This container is filled with 50kg of liquid argon and a thick layer of the element in its gas form.

BBC: Dark Matter: Experiment to shed light on dark particles

This will generate two flashes of light - one in the liquid argon and another in the gas - which will be detected by the receptors.

BBC: Dark Matter: Experiment to shed light on dark particles

For instance, the ultra-thin layers of graphene (a two-dimensional form of graphite) are formed by injecting liquid solutions containing carbon and silicon into an extremely hot, ionised gas (plasma) of argon.

ECONOMIST: MONITOR