helium has definitions from the field of chemistry
1
[ noun ] (chemistry) a very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas)

Synonyms

atomic_number_2 He

Used in print

(1961 Research Highlights of the National Bureau of...)

The efforts and accomplishments fall_into three main categories : absolute thermometry based upon the velocity of sound in helium gas , secondary thermometry involving principally studies of the behavior of germanium resistors , and helium 4 vapor-pressure measurements ( see p. 144 ) .

The efforts and accomplishments fall_into three main categories : absolute thermometry based upon the velocity of sound in helium gas , secondary thermometry involving principally studies of the behavior of germanium resistors , and helium 4 vapor-pressure measurements ( see p. 144 ) .

An acoustical interferometer has been constructed and used , with helium gas as the thermometric fluid , to measure temperatures near 4.2 and 2.1 * * f .

When values of temperature derived with this instrument were compared with the accepted values associated with liquid helium 4 vapor_pressures , differences of about 10 and 7 millidegrees respectively were found .

Carbon resistors and impurity doped germanium resistors have been investigated for use as precision secondary thermometers in the liquid helium temperature region .

Related terms

chemical_element noble_gas

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