Liquid oxygen

Liquid oxygen has a clear cyan color and is strongly paramagnetic: it can be suspended between the poles of a powerful horseshoe magnet.

Further, if soaked in liquid oxygen, some materials such as coal briquettes, carbon black, etc., can detonate unpredictably from sources of ignition such as flames, sparks or impact from light blows.

[5] The tetraoxygen molecule (O4) was predicted in 1924 by Gilbert N. Lewis, who proposed it to explain why liquid oxygen defied Curie's law.

In the 1950s, during the Cold War both the United States' Redstone and Atlas rockets, and the Soviet R-7 Semyorka used liquid oxygen.

Later, in the 1960s and 1970s, the ascent stages of the Apollo Saturn rockets, and the Space Shuttle main engines used liquid oxygen.

Liquid oxygen ( O 2 ) ( cyan liquid) in a beaker.
When liquid oxygen ( O 2 ) is poured from a beaker into a strong magnet, the oxygen is temporarily suspended between the magnet poles, owing to its paramagnetism.
A U.S. Air Force technician transfers liquid oxygen to a Lockheed Martin C-130J Super Hercules aircraft at the Bagram Airfield , Afghanistan.
Insulated evaporator and storage container setup for liquid oxygen
SpaceX's liquid oxygen ball at Cape Canaveral