helium nel dizionario PONS

Esempi monolingue (non verificati dalla Redazione di PONS)

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Hydrogen burning continues in the stars shell, producing helium ash that falls into the core.
en.wikipedia.org
This period in a star's evolution corresponds to the core helium-burning phase, whereas the main sequence is the core hydrogen-burning phase.
en.wikipedia.org
Generally a cryocooler, also known as a coldhead, is used to recondense some helium vapor back into the liquid helium bath.
en.wikipedia.org
The (helium-3) helion consists of two protons and one neutron.
en.wikipedia.org
As of 2007, no stable neutral molecules involving covalently bound helium or neon are known.
en.wikipedia.org
A gas, usually helium, is fed to the propellant tanks under pressure through a series of check and safety valves.
en.wikipedia.org
The splitting of the lithium nuclei produced helium nuclei.
en.wikipedia.org
These spectra contain quantitative information on all major elements in the samples except for hydrogen, helium and lithium.
en.wikipedia.org
In a final production step, most of the helium that is produced is liquefied via a cryogenic process.
en.wikipedia.org
This is far beyond what would be expected for a normal core helium burning star.
en.wikipedia.org

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