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25 Οκτ 2024 · Helium, chemical element, inert gas of Group 18 (noble gases) of the periodic table. The second lightest element, helium is a colorless, odorless, and tasteless gas that becomes liquid at -268.9 degrees Celsius. The boiling and freezing points of helium are lower than those of any other known substance.
Definitions of helium. noun. 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: He, atomic number 2. see more. Pronunciation. US. /ˈhiliəm/ UK. /ˈhiliəm/ Cite this entry. Style: MLA.
HELIUM definition: 1. a chemical element that is a gas lighter than air, that will not burn and is used in balloons…. Learn more.
Helium is a chemical element. Its official symbol is He, and its atomic number is 2, which means it has two protons in its nucleus. Helium was named after Helios – the Greek Titan of the Sun – because it was first observed when analysing sunlight during a solar eclipse in 1868.
Definition of helium noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
The meaning of HELIUM is a chemical element of the noble gas group with atomic number 2 that is found especially in natural gases and used chiefly for inflating airships and balloons, as a coolant for superconductors, and as a component of inert atmospheres (as in welding) —often used before another noun.
HELIUM meaning: 1. a chemical element that is a gas lighter than air, that will not burn and is used in balloons…. Learn more.
