Liquid helium
Helium is colourless, odourless, non-toxic, non-corrosive and non-combustible.
With a value of 4.2 degrees Kelvin or –269 °C, it has the lowest boiling point of any gas and as a result, liquid helium is the coldest matter on Earth.
This is what makes it ideally suited to be used as cryogen in a number of cutting edge applications including superconductivity in magnetic resonance imaging (MRI), nuclear magnetic resonance (NMR), particle physics and other cryogenic applications.
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