About The Word Helium
Learn about the word Helium to help solve your crossword puzzle. Discover Helium definitions and meaning, origins, synonyms, related terms and more at the free Crossword Dictionary.
Helium
| Helium Definition And Meaning |
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What's The Definition Of Helium?
[n] 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 | Synonyms for Helium: atomic number 2 | He Related Terms | Find terms related to Helium: See Also | argonon | chemical element | element | inert gas | noble gas Helium In Webster's Dictionary \He"li*um\, n. [NL., fr. Gr. ? the sun.] (Chem.)
A gaseous element found in the atmospheres of the sun and
earth and in some rare minerals.
\He"li*um\ (h[=e]"l[i^]*[u^]m), n. [NL., fr. Gr. "h`lios the sun.] (Chem.) An inert, monoatomic, gaseous element occurring in the atmosphere of the sun and stars, and in small quantities in the earth's atmosphere, in several minerals and in certain mineral waters. Symbol, He; at. wt., 4. Helium was first detected spectroscopically in the sun by Lockyer in 1868; it was first prepared by Ramsay in 1895. Helium has a density of 1.98 compared with hydrogen, and is more difficult to liquefy than the latter. Chemically, it belongs to the argon group and cannot be made to form compounds. It is a decomposition product of the radium emanation. |
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