Helium is inert, does not combine with other elements or compounds under normal conditions, and is the coldest gas when in liquid form. Due to its low content in the air, it is produced as a by-product of natural gas that contains more than 0.5% helium when considering manufacturing cost. It is mainly used for cooling electric coils of MRI (Magnetic Resonance Imaging), atmospheric gas for optical fiber sintering, and breathing mixed gas (diving gas), etc.
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