Dictionary » V » Vacuum



Origin: L, fr. Vacuus empty. See Vacuous.

1. (Science: physics) A space entirely devoid of matter (called also, by way of distinction, absolute vacuum); hence, in a more general sense, a space, as the interior of a closed vessel, which has been exhausted to a high or the highest degree by an air pump or other artificial means; as, water boils at a reduced temperature in a vacuum.

2. The condition of rarefaction, or reduction of pressure below that of the atmosphere, in a vessel, as the condenser of a steam engine, which is nearly exhausted of air or steam, etc.; as, a vacuum of 26 inches of mercury, or 13 pounds per square inch. Vacuum brake, a kind of continuous brake operated by exhausting the air from some appliance under each car, and so causing the pressure of the atmosphere to apply the brakes.

(Science: medicine) vacuum pan, a glass tube provided with platinum electrodes and exhausted, for the passage of the electrical discharge; a geissler tube. Vacuum valve, a safety valve opening inward to admit air to a vessel in which the pressure is less than that of the atmosphere, in order to prevent collapse. Torricellian vacuum. See Torricellian.

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Mechanism behind Cyanobacterial Cryptobiosis?

Cyanobacteria seem able to, as a colony at least, undergo some form of cryptobiosis (well enough to survive 553 days in the vacuum of space). The only information I can find on the mechanism(s) behind this feet are that they form something called microbial mats which include coatings ...

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by NMLevesque
Fri Nov 22, 2013 5:54 pm
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Topic: Mechanism behind Cyanobacterial Cryptobiosis?
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Views: 1292

Speedy Molecule

It would not affect other molecules if it were in vacuum.

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by JackBean
Sun Feb 17, 2013 10:38 pm
Forum: Molecular Biology
Topic: Speedy Molecule
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Re: Theories - Origin of Life

... what is studied by the chaos theory. If I try to predict a precise trajectory of a little slice of, ….. lets say, polyurethane foam sucked into my vacuum cleaner, I doubt that it can be easily done. But based on the “controlling influence” of the vacuum cleaner properties and, most importantly, ...

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by Nick7
Fri Feb 24, 2012 1:31 am
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 562
Views: 929128


... simply this test: you go to the chapel of the Holy Blood, you check the conditions (blood simply under a closed bottle of parfum, but not in the vacuum), you wait 6 months (the time you will, even 2000 years...), and you go there again... Of course, you won't be able to reproduce it: it goes ...

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by christianstrategies
Tue Feb 21, 2012 5:57 pm
Forum: Evolution
Topic: Any SOLID arguments against evolution?
Replies: 309
Views: 544203

Re: Blood is always red, never blue.

... when deoxygenated. Explain to me why blood taken from a vein, that is caring deoxygenated blood to the heart, and collected in a test tube that is vacuum sealed is brick red in color. The blood leaving the vessel is not receiving any oxygen when it enters the tube due to the fact that the test ...

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by zanebo
Sun Sep 11, 2011 5:06 am
Forum: Human Biology
Topic: Blood is always red, never blue.
Replies: 57
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