CAS Registry ID:
Helium (Greek helios meaning "the sun")
was isolated by Sir William Ramsay in 1895, from clevite and conclusively
found not to be a metal, but the name was unchanged. Helium occurs
in economically extractable amounts in certain natural gases and
is used as a lifting gas for balloons and blimps, as a cryogenic
cooling liquid for super- conducting magnets and as a filler gas
for deep-sea diving.