One of the other reasons helium is used besides being inert and lightweight is its use in cryocooling. That it is why it is used in MRI machines to cool the sup

One of the other reasons helium is used besides being inert and lightweight is its use in cryocooling. That it is why it is used in MRI machines to cool the superconducting magnets. The melting point of helium is 0.95 Kelvin (-458 Farenheit), and is used to cool the superconducting magnets to below 10 K [1]. The other most commonly used liquid for crycooling is liquid nitrogen. But Nitrogen freezes at 63 K (-320 F) so you can not get it cold enough for all applications. Liquid helium is also used in the Aerospace industry for testing or running spacecraft hardware that will be at those extremely cold temperatures. For example the optics of the James Webb Space Telescope need to be that cold in order to measure the weak infrared signals, else the thermal noise from the instrument itself would overwhelm the signal [2] [1] https://www.lindeus.com/en/industries/medical/_mri/liquid_helium.html https://www.lindeus.com/en/industries/medical/_mri/liquid_he... [2] https://jwst.nasa.gov/content/about/faqs/faq.html#temps https://jwst.nasa.gov/content/about/faqs/faq.html#temps