Heliul este un gaz nobil care se găsește în cantități mici în atmosferă, mai puțin de 0,001% în aer.
Are cel mai scăzut punct de fierbere și cel mai scăzut punct de topire dintre elementele chimice și apare numai în stare gazoasă, în afara condițiilor extreme.
Detalii despre heliu:
Heliul este utilizat în:
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