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Atmospheric pressure   /ˌætməsfˈɛrɪk prˈɛʃər/   Listen
Atmospheric pressure

noun
1.
The pressure exerted by the atmosphere.  Synonyms: air pressure, pressure.






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"Atmospheric pressure" Quotes from Famous Books



... fruit would reach the consumer's pursed lips charmingly modified by its passage along the length of the sweet. One needed but to approximate a vacuum at the upper end of the candy, and the mighty and mysterious laws of atmospheric pressure completed the benign process. ...
— The Wrong Twin • Harry Leon Wilson

... properties where a preponderance of water is the trouble, but also in providing an automatic, and therefore extremely cheap, mode of water-raising and supply, which in simplicity is thus far unexampled. Atmospheric pressure alone is relied on. The well-known process of the syphon is the basis, but with this essential difference, that a large proportion of the water drawn up to the apex of the syphon is super-elevated to heights regulated by the fall obtained ...
— Getting Gold • J. C. F. Johnson

... he ordered a beer and used it to wash down another oxidation tablet. It wasn't good beer; it didn't even deserve the name. The atmospheric pressure was so low as to boil all the carbon dioxide out of it, so the brewers never put it back in ...
— The Man Who Hated Mars • Gordon Randall Garrett

... the interior is great enough to melt all rocks at atmospheric pressure, it does not follow that the interior is fluid. Pressure raises the fusing point of rocks, and the weight of the crust may keep the interior in what may be called a solid state, although so hot as to be a liquid or a gas were the pressure to ...
— The Elements of Geology • William Harmon Norton

... street, and extends under the great thoroughfare to a point a little below Murray street. It is dry and clean, is painted white, and is lighted with gas. It passes under all the gas and water pipes and sewers. The cars are made to fit the tunnel, and are propelled by means of atmospheric pressure. A strong blast of air, thrown out by means of an immense blowing machine, is forced against the rear end of a car, and sends it along the track like a sail-boat before the wind. This current of course secures ...
— Lights and Shadows of New York Life - or, the Sights and Sensations of the Great City • James D. McCabe

... deg. C., it is converted into the liquid state, the pressure needed increasing with the rise of temperature, and decreasing with the lowering of the temperature, until at—82 deg. C. it becomes liquid under ordinary atmospheric pressure. The critical point of the gas is 37 C., at which temperature a pressure of 68 atmospheres is required for liquefaction. The properties of liquid and solid acetylene have been investigated by D. Mcintosh (Jour Chem. Soc., Abs., 1907, i. 458). A great ...
— Project Gutenberg Encyclopedia

... absorption of tones, i. e., the location of the sound, is of great importance. Finally, it must not be forgotten that people's ability to hear varies with the weather. Colds reduce the power, and not a few people are influenced by temperature, atmospheric pressure, etc. These considerations show the degree in which auditory illusions can be of importance even in tests of their nature and existence. They show above all that the same object of comparison under the same circumstances ...
— Robin Hood • J. Walker McSpadden

... water at 32 deg.; mercury at 39 deg. 5' below zero. All fluids change their degree of freezing in accordance with mixtures of alcohol or solutions of salt used for the purpose. Also, according to the atmospheric pressure; and by this law heights of mountains are measured by the ...
— The Sailor's Word-Book • William Henry Smyth

... first glance I thought we had struck a tropical depression of the first magnitude, which, flouting all the laws of meteorology, had somehow found its way to the English Channel; but the engineer explained to me that, as I have already stated, the low atmospheric pressure in the boat was due to the conning-tower hatch being ...
— The Diary of a U-boat Commander • Anon

... was torture to his abnormally acute ears. Increased atmospheric pressure did funny things to his chest and stomach. And quick and sure-footed on Mars, he struggled constantly against the heavy gravity that made all ...
— Native Son • T. D. Hamm

... omnibuses, as I remember them half a century ago,—they may still keep to the same habit, for aught that I know,—used to put up the sign "Complet" as soon as they were full. Our public conveyances are never full until the natural atmospheric pressure of sixteen pounds to the square inch is doubled, in the close packing of the human sardines that fill the all-accommodating vehicles. A new-comer, however well mannered and well dressed, is not very welcome under these circumstances. In the same way, our tables are full of books half-read and ...
— The Autocrat of the Breakfast-Table • Oliver Wendell Holmes, Sr. (The Physician and Poet not the Jurist)

... put to this new generation of air, when about a fifteenth of the whole is produced, by its increasing pressure; and a similar boundary is fixed to its absorption or destruction by the decrease of atmospheric pressure. As water requires more heat to convert it into vapour under a heavy atmosphere than under a light one, so in letting off the water from muddy fish-ponds great quantities of air-bubbles are seen to ascend from ...
— The Botanic Garden - A Poem in Two Parts. Part 1: The Economy of Vegetation • Erasmus Darwin

... warm. A steam-boiler has the furnace walls surrounded by water, and its function is to transmit molecular movement (heat, or energy) through the furnace plates to the water until the point is reached when steam generates. At atmospheric pressure—that is, if not confined in any way—steam would fill 1,610 times the space which its molecules occupied in their watery formation. If we seal up the boiler so that no escape is possible for the steam molecules, their motion becomes more and more rapid, and pressure is developed ...
— How it Works • Archibald Williams

... Domestic Science receiving particular attention on Mars is the PREPARATION OF FOODS. With an atmospheric pressure of only eight pounds to the square inch, water boils at 175 degrees on our planet. This temperature is inadequate for cooking foods properly, especially the coarser varieties. But recourse is had to the cooking of food in vacuum or ...
— The Planet Mars and its Inhabitants - A Psychic Revelation • Eros Urides and J. L. Kennon

... examined 59 per cent had adenoids, while only 6 per cent of the general run of the children in the neighborhood had this trouble. In mouth breathing, the current of air entering the mouth draws out some of the air from the Eustachian tube which ventilates the middle ear and unequalizes the atmospheric pressure on the eardrum, causing it to sink in and to blunt the hearing. An examination of the eardrums of school children in New York who are mouth breathers showed a high percentage of deafness, incipient or ...
— Civics and Health • William H. Allen

... were much smaller than in the Cockerill compressor, while the efficiency of the apparatus was largely increased. The actual engine duty per horse power and per hour was raised, as a maximum, to 384 cubic feet of air at atmospheric pressure, and compressed to 90 lb. per square inch, a marked increase on the duty of the compressors in use at the St. Fargeau station. The Cockerill compressors experimented on at the same time showed a maximum duty of 306 cubic feet of air. A considerable advantage is claimed in drawing ...
— Scientific American Supplement, No. 803, May 23, 1891 • Various

... hour the Indians righted the canoe, which had been drawn on shore, and, to their amazement, and almost terror, they found beneath it the dead babe, wrapped in its cloak, having been kept in its place by the atmospheric pressure. ...
— Woman on the American Frontier • William Worthington Fowler

... sickness" in many people. Many years ago I climbed by the glacier-pass known as the Weissthor from Macugnaga to the Riffel Alp, with a stylographic pen in my pocket. The reservoir of the pen contained a little air, which expanded as the atmospheric pressure diminished, and at 10,000 feet I found most of the ink emptied into my pocket. Probably one cause of the discomfort called "mountain sickness" arises from a similar expansion of gas contained in the digestive canal, and in the ...
— More Science From an Easy Chair • Sir E. Ray (Edwin Ray) Lankester

... the entire body bitten clean off, a hint of the monsters which must haunt the lower depths. The pressure of the air must be excessive, for many of the fishes have their swimming bladders fairly forced out of their mouths by the lessening of atmospheric pressure as they are drawn to the surface. When a basket starfish finds one of the baits in that sunless void far beneath our boat, he hugs it so tenaciously that the upward jerks of the reel only make him hold the ...
— The Log of the Sun - A Chronicle of Nature's Year • William Beebe

... elastic force exceeds that of the atmosphere. In this manner the alternate motion of the piston in the cylinder will be continued; the efficient force which urges it being estimated by the excess of the actual pressure of the steam from the boiler above the atmospheric pressure. The superior simplicity and lightness of the high-pressure engine must now be apparent, and these qualities recommend it strongly for all purposes in which the engine itself must be ...
— The Mirror of Literature, Amusement, and Instruction - Vol. 19. No. 575 - 10 Nov 1832 • Various

... produce absorption of deposited matters, and to force an abundance of blood through palsied muscles, from which they may derive a proper supply of nutriment, and to which they may give up the products of waste. All this can be accomplished by massage, mechanical movements, regulation of the atmospheric pressure on the body, baths, ...
— The People's Common Sense Medical Adviser in Plain English • R. V. Pierce

... of the lower limbs. But here comes in a simple and admirable contrivance. The smooth, rounded head of the thighbone, moist with glairy fluid, fits so perfectly into the smooth, rounded cavity which receives it, that it holds firmly by suction, or atmospheric pressure. It takes a hard pull to draw it out after all the ligaments are cut, and then it comes with a smack like a tight cork from a bottle. Holding in this way by the close apposition of two polished surfaces, the lower extremity ...
— Atlantic Monthly, Volume 11, Issue 67, May, 1863 • Various

... vacuum by a galvanic battery, none of them will explode; if any gas be introduced so as to produce a gentle pressure during the decomposition, then a rapid evolution of gases will result; the results of decomposition in a vacuum differ from those under atmospheric pressure or when they are burnt in a pistol, musket, a cannon, or in a mine; where we have little or no pressure it is difficult to get these substances to burn rapidly; nitro-glycerin is more difficult to ...
— Scientific American, Vol. 17, No. 26 December 28, 1867 • Various

... had been carrying further that progress without which, as just shown, rational mechanics could not be disentangled. In hydrostatics, Stevinus had extended and applied the discovery of Archimedes. Torricelli had proved atmospheric pressure, "by showing that this pressure sustained different liquids at heights inversely proportional to their densities;" and Pascal "established the necessary diminution of this pressure at increasing ...
— Essays on Education and Kindred Subjects - Everyman's Library • Herbert Spencer

... by counterclockwise gyre (broad, circular system of currents) in the southern Indian Ocean; unique reversal of surface currents in the northern Indian Ocean; low atmospheric pressure over southwest Asia from hot, rising, summer air results in the southwest monsoon and southwest-to-northeast winds and currents, while high pressure over northern Asia from cold, falling, winter air results in the northeast monsoon and northeast-to-southwest winds and currents; ...
— The 2003 CIA World Factbook • United States. Central Intelligence Agency

... Trevithick borrowed it from Evans, but Evans himself never said so, and it is more likely that each of these inventors worked it out independently. Watt introduced his steam to the cylinder at only slightly more than atmospheric pressure and clung tenaciously to the low-pressure theory all his life. Boulton and Watt, indeed, aroused by Trevithick's experiments in high-pressure engines, sought to have Parliament pass an act forbidding high ...
— The Age of Invention - A Chronicle of Mechanical Conquest, Book, 37 in The - Chronicles of America Series • Holland Thompson

... inside its long shell, and there is a row of holes in the shell itself. It is conjectured that the abalone perhaps exhausts the air under the shell, and so causes the shell to cling more tightly to the rock than ever, through atmospheric pressure. It is very difficult to take an abalone from its rocky home, ...
— Out of the Triangle • Mary E. Bamford

... Kopp, begun in 1842, on the molecular volumes, i.e. the volume occupied by one gramme molecular weight of a substance, of liquids measured at their boiling-point under atmospheric pressure, brought to light a series of additive relations which, in the case of carbon compounds, render it possible to predict, in some measure, the composition of the substance. In practice it is generally more convenient to determine the density, the molecular volume ...
— Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 - "Chtelet" to "Chicago" • Various

... rapidly increased after sunrise, and at later hours within the confined hollows, such as Petra and the basin of the Dead Sea, rose to that of (I suppose) an Indian climate—but above all the effects of heat was that produced by the weight of atmospheric pressure at probably the lowest position in the whole surface of the globe: about 1300 ...
— Byeways in Palestine • James Finn

... not contain any hydrochloric acid, close the pinchcocks (a) and (k) and open (h). No bubbles should pass through (D) or (G) after a few seconds. When assured that the fittings are tight, close (h) and open (a) cautiously to admit air to restore atmospheric pressure. This precaution is essential, as a sudden inrush of air will project liquid from (D) or (F'). Reconnect the rubber tube with the flask (A). Open the pinchcocks (a) and (k) and blow over about 10 cc. of the hydrochloric acid from (A) ...
— An Introductory Course of Quantitative Chemical Analysis - With Explanatory Notes • Henry P. Talbot

... this feeder a half inch opening is cut at the bottom, fig 4, a, and an inclined plane b, reaching half way up the depth of the trough; and a sheet of perforated tin, c (placed horizontally from point b,) through which the bees suck the food, which is kept at the same level by atmospheric pressure; for as the food is drawn down below the mouth of the bottle, d, air forces itself into the bottle, and the same quantity of food trickles down into the feeder, a piece of glass, e, exactly the same size as the feeder, is placed over it, through which the bees may be seen whilst ...
— A Description of the Bar-and-Frame-Hive • W. Augustus Munn

... of Niflheim is approximately 1 g, the atmospheric pressure approximately 1 atmosphere, and the average ...
— Uller Uprising • Henry Beam Piper, John D. Clark and John F. Carr

... The atmospheric pressure is here so small that they frequently bleed at the nose and mouth when hunted. We have already given our experience in ascending high altitudes. We may add that while the pulse of Boussingault beat 106 pulsations at the ...
— The Andes and the Amazon - Across the Continent of South America • James Orton

... Agricultural Gazette has stated, that Professor Brocklesby, of Hartford, in America, had observed the same phenomena, in the case of two springs in that country; and explained, that the cause was 'the diminished atmospheric pressure which ...
— Farm drainage • Henry Flagg French

... was astride the rubbery inflated covering, clawing and tearing. The thing collapsed and went flat between his knees. He saw the mist of moisture-laden escaping air; felt the quick swelling and the jarring collapse as internal organs exploded from the atmospheric pressure inside the brute's body. Nauseated, he crawled away ...
— The Copper-Clad World • Harl Vincent

... Professor Chamberlin, in a profound study of the period (appendix to vol. ii, "Geology"), suggests that the new land from New Zealand to Antarctica may have diverted the currents (sea and air) up the Indian Ocean, and caused a low atmospheric pressure, much precipitation of moisture, and perpetual canopies of clouds to shield the ice from the sun. Since the outer polar regions themselves had been semi-tropical up to that time, it is very difficult to see how this will ...
— The Story of Evolution • Joseph McCabe

... difficulty. Conscious that the human organism, normally capable of sustaining an atmospheric pressure of 19 tons, when elevated to a considerable altitude in the terrestrial atmosphere suffered with arithmetical progression of intensity, according as the line of demarcation between troposphere and stratosphere was ...
— Ulysses • James Joyce

... the Maximum Weight of Saturated Aqueous Vapour which can be contained in 1 kilo. of Air at Different Pressure and Temperatures — Calculation of the Necessary Weight and Volume of Air, and of the Least Expenditure of Heat, per Drying Apparatus with Heated Air, at the Atmospheric Pressure: A, With the Assumption that the Air is Completely Saturated with Vapour both before Entry and after Exit from the Apparatus — B, When the Atmospheric Air is Completely Saturated before entry, but at its exit is only 3/4, 1/2 or ...
— The Dyeing of Woollen Fabrics • Franklin Beech



Words linked to "Atmospheric pressure" :   gas pressure, sea-level pressure, pressure, barometric pressure, overpressure, compartment pressure



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