helium


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helium

 (He) [he´le-um]
a chemical element, atomic number 2, atomic weight 4.003. (See Appendix 6.) Helium is a chemically inert element that is odorless, tasteless, and noncombustible. Because of its low density it is easily moved through the air passages and therefore requires little effort in breathing on the part of the patient in respiratory distress. Although helium itself has no chemical therapeutic value, when combined with oxygen it facilitates delivery of oxygen to the lungs (see helium-oxygen therapy). It should be noted that helium causes the voice to be high-pitched and the spoken word difficult to understand. This should be explained to the patient with the assurance that the effect is harmless and temporary.
helium-oxygen therapy the administration of a mixture of helium and oxygen (commonly 80 per cent He and 20 per cent O2, or 70 per cent He and 30 per cent O2); used in the management of airway obstruction associated with bronchospasm or bronchial asthma. The He-O2 mixture is about one third the density of air. This reduces turbulent flow and the patient effort required for ventilation.

he·li·um (He),

(hē'lē-ŭm),
A gaseous element present in minute amounts in the atmosphere (0.000524% of dry volume); atomic no. 2, atomic wt. 4.002602; used as a diluent of medicinal gases; used as a diluent of oxygen principally in nonmedical applications, and in its liquid form as the coolant for super-conducting magnets (as in magnetic resonance imaging).
[G. hēlios, the sun]

he·li·um

(hē'lē-ŭm)
A gaseous element present in minute amounts in the atmosphere (0.000524% of dry volume); atomic no. 2, atomic wt. 4.002602; used as a diluent of medicinal gases, particularly oxygen.
[G. hēlios, the sun]

he·li·um

(He) (hē'lē-ŭm)
A gaseous element present in minute amounts in the atmosphere used as a diluent of medicinal gases.
[G. hēlios, the sun]
References in classic literature ?
"And perhaps too because of the great distance that separates Helium and Gathol, as well as the comparative insignificance of my little free city, which might easily be lost in one corner of mighty Helium," added Gahan.
"But what practice in the art of war has a people which nature has thus protected from attack?" asked Tara of Helium, who had liked the young jed's answer to her previous question, but yet in whose mind persisted a vague conviction of the possible effeminacy of her companion, induced, doubtless, by the magnificence of his trappings and weapons which carried a suggestion of splendid show rather than grim utility.
May I dare to say, Tara of Helium, that I am hoping for the day when you will visit Gathol that my people may see one who is really beautiful?"
"The women of Helium are taught to frown with displeasure upon the tongue of the flatterer," rejoined the girl, but Gahan, Jed of Gathol, observed that she smiled as she said it.
The guests had risen and were slowly making their way toward the expanse of scarlet sward at the south end of the gardens where the dance was to be held, when Djor Kantos came hurriedly toward Tara of Helium. "I claim--" he exclaimed as he neared her; but she interrupted him with a gesture.
"No laggard may claim Tara of Helium; but haste now lest thou lose also Olvia Marthis, whom I have never seen wait long to be claimed for this or any other dance."
"And you mean to say that you came for Tara of Helium only after having lost Olvia Marthis?" demanded the girl, still simulating displeasure.
"Oh, Tara of Helium, you know better than that," insisted the young man.
It was in the forenoon that we arrived above the mile-high scarlet tower which marks greater Helium from her twin city.
Our hatred of the common enemy is sufficient bond to insure our loyalty to each other, and after we have defiled the Princess of Helium there will be still greater reason for the maintenance of our allegiance--unless I greatly mistake the temper of her lord."
If he should lead Matai Shang to that hollowed spot, then, too, should he lead John Carter, Prince of Helium.
I set the pointer here upon the right-hand dial which represents the eastern hemisphere of Barsoom, so that the point rests upon the exact latitude and longitude of Helium. Then I start the engine, roll up in my sleeping silks and furs, and with lights burning, race through the air toward Helium, confident that at the appointed hour I shall drop gently toward the landing-stage upon my own palace, whether I am still asleep or no."