Geiger counters use an electrically charged wire inside a metal tube filled with methane and argon gas.

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Neutrinos react with chlorine in the fluid and change it to radioactive argon, a gas.

ECONOMIST: Particle physics

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

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