Cryogenic studies are those studies performed at very low temperatures. The best supporting substance is

The best supporting substance for cryogenic studies is liquid helium, which is one of the coldest substances on Earth, with a boiling point of just 4.2 Kelvin (-268.8°C or -452.8°F). At this temperature, many materials exhibit unique properties and behaviors, such as superconductivity, superfluidity, and changes in electrical and magnetic properties. Liquid helium is commonly used in cryogenic studies, such as in the study of low-temperature physics, materials science, and astrophysics, among others. Other cryogenic fluids, such as liquid nitrogen and liquid hydrogen, are also used for some studies but at higher temperatures than liquid helium.