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A pyrophoric substance ( from Greek πυροφορος, purophoros, " fire-bearing ") is a substance that will ignite spontaneously in air ( cf.
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pyrophoric and substance
L Explosive substance or article containing an explosive substance and presenting a special risk ( e. g., due to water-activation or presence of hypergolic liquids, phosphides, or pyrophoric substances ) needing isolation of each type ( 1. 1L, 1. 2L, 1. 3L ).
Thickened triethylaluminium, a napalm-like substance that ignites in contact with air, is known as thickened pyrophoric agent, or TPA.
pyrophoric and from
The creation of sparks from metals is based on the pyrophoricity of small metal particles, and pyrophoric alloys are made for this purpose.
pyrophoric and is
The metal is extremely reactive and pyrophoric, reacting with water even at − 116 ° C (− 177 ° F ).
Caesium metal is highly reactive and very pyrophoric.
It glows in the dark ( when exposed to oxygen ) with a very faint tinge of green and blue, is highly flammable and pyrophoric ( self-igniting ) upon contact with air and is toxic ( causing severe liver damage on ingestion ).
Finely powdered strontium metal is pyrophoric meaning it will ignite spontaneously in air at room temperature.
Powdered thorium metal is often pyrophoric and requires careful handling.
Tungsten, usually alloyed with nickel and iron or cobalt to form heavy alloys, is used in kinetic energy penetrators as an alternative to depleted uranium, in applications where uranium's additional pyrophoric properties are not required ( for example, in ordinary small arms bullets designed to penetrate body armor ).
Finely divided uranium metal presents a fire hazard because uranium is pyrophoric ; small grains will ignite spontaneously in air at room temperature.
DU is pyrophoric ; the heated fragments of the penetrator ignite after impact on contact with air, setting fire to fuel and / or ammunition in the target vehicle, thereby compensating for the lack of an explosive warhead in the penetrator.
Without some form of electromechanical device, such as a device to release several of the compounds that do spontaneously ignite upon contact with the oxygen in air ( such as silane, a pyrophoric gas, or rubidium ), or some form of triggering device located at the source of the fire, there is no scientifically known method for the brain to trigger explosions and fires at a distance.
* Uranium is pyrophoric, as shown in the vaporization of depleted uranium penetrator rounds into burning dust upon impact with their targets.
Hydrazine is hypergolic with oxidants like dinitrogen tetroxide, but not truly pyrophoric.
Metallic plutonium is a fire hazard and pyrophoric ; under the right conditions it may ignite in air at room temperature.
A TEA-TEB pyrophoric system is used to provide multiple restart capability on the upper stage.
Raney nickel is pyrophoric and must be handled with care.
Due to its large surface area and high volume of contained hydrogen gas, dry, activated Raney nickel is a pyrophoric material that should be handled under an inert atmosphere.
Illinois law states that a dragon's breath round is any round that " contains exothermic pyrophoric misch metal as the projectile and is designed for the purpose of throwing or spewing a flame or fireball to simulate a flame-thrower ".
Silane is pyrophoric, that is, due to the presence of oxygen, it spontaneously combusts in air:
Thickened pyrophoric agent, a pyrophoric replacement of napalm, is a triethylaluminium thickened with polyisobutylene.
pyrophoric and spontaneously
Although not hypergolic in the strict sense ( but rather pyrophoric ), triethylborane, which ignites spontaneously in the presence of air, was used for engine starts in the SR-71 Blackbird and the F-1 engines used in the Saturn V rocket.
Another method involves the use of flint and steel, during which a spark ( a small particle of pyrophoric metal ) spontaneously combusts in air, starting fire instantaneously.
They can also be use for transportation of substances that react spontaneously with air ( pyrophoric reagents ).< ref > Norton, Jack.
pyrophoric and air
Mildly pyrophoric solids ( such as lithium aluminium hydride and sodium hydride ) can be handled in the air for brief periods of time, but the containers must be flushed with inert gas before storage.
Magnesium powder and shavings are pyrophoric ( they oxidise rapidly when exposed to the air ).
pyrophoric and .
* Mischmetal, a pyrophoric alloy used in lighter flints, contains 25 % to 45 % lanthanum.
Alternative compositions exist for different uses, e. g. triethylaluminium, a pyrophoric compound that aids ignition.
Depleted-uranium penetrators have the advantage of being pyrophoric and self-sharpening on impact, resulting in intense heat and energy focused on a minimal area of the target's armor.
Most pyrophoric fires should be extinguished with a Class D fire extinguisher for burning metals.
Nano materials are pyrophoric ( most of them.
Small amounts of pyrophoric liquids are often supplied in a glass bottle with a PTFE-lined septum.
Thus, many pyrophoric solids are sold as solutions, or dispersions in mineral oil or lighter hydrocarbon solvents.
Small amounts of pyrophoric materials and empty containers must be disposed of carefully.
substance and from
And although these insights into the nature of art may be in themselves insufficient for a thoroughgoing philosophy of art, their peculiar authenticity in this day and age requires that they be taken seriously and gives promise that from their very substance, new and valid chapters in the philosophy of art may be written.
But a realization that each group has much of substance to learn from the other also developed, and a strong conviction grew that each had insights and dimensions to contribute to ethically acceptable solutions of urgent political issues.
In the first trial an inert substance was disseminated from a boat travelling some ten miles off shore under appropriately selected meteorological conditions.
Whether this abnormal TSH differs chemically from pituitary TSH, or is, alternatively, normal TSH with its period of effectiveness modified by some other blood constituent, cannot be decided without chemical study of the activity in the blood of these patients and a comparison of the substance responsible for the blood activity with pituitary Aj.
At any rate, the substance of Eichmann's testimony was that all his actions flowed from his membership in the party and the SS, and though the Prosecutor did his utmost to prove actual personal hatred of Jews, his success on this score was doubtful and the anti-Semitic lesson weakened to that extent.
Blood blisters could be prevented from forming by rubbing a work blister immediately with any hard nonpoisonous substance.
Dignity and comfort, in a contemporary manner, reflecting the best aspects of today's design, with substance and maturity, keynote the Perennian collection from Heritage.
`` A remarkable substance '', says Dr. Keys, `` quite apart from its tendency to be deposited in the walls of arteries ''.
The rough-skinned newt ( Taricha granulosa ) from North America and other members of its genus contain the neurotoxin tetrodotoxin ( TTX ), the most toxic non-protein substance known and almost identical to that produced by pufferfish.
An acid ( from the Latin acidus / acēre meaning sour ) is a substance which reacts with a base.
In order to help reestablish his name and improve the image of his business from the earlier controversies associated with the dangerous explosives, Nobel had also considered naming the highly powerful substance " Nobel's Safety Powder ", but settled with Dynamite instead, referring to the Greek word for ' power '.
According to the teaching of Arius, the preexistent Logos and thus the incarnate Jesus Christ was a created being ; that only the Son was directly created and begotten by God the Father, before ages, but was of a distinct, though similar, essence or substance from the Creator ; his opponents argued that this would make Jesus less than God, and that this was heretical.
The word originally referred to a solid waxy substance derived from the sperm whale ( now called ambergris ).
After James Prescott Joule had determined the mechanical equivalent of heat, Lord Kelvin approached the question from an entirely different point of view, and in 1848 devised a scale of absolute temperature which was independent of the properties of any particular substance and was based solely on the fundamental laws of thermodynamics.
The first deposit on the wall of a cavity, forming the " skin " of the agate, is generally a dark greenish mineral substance, like celadonite, delessite or " green earth ", which are rich in iron probably derived from the decomposition of the augite in the enclosing volcanic rock.
White crystals of a substance called ambrein can be separated from ambergris by heating raw ambergris in alcohol, then allowing the resulting solution to cool.
This text clarified the concept of an element as a substance that could not be broken down by any known method of chemical analysis, and presented Lavoisier's theory of the formation of chemical compounds from elements.
The substance may be from the external environment or formed within the body.
His best-known discoveries are the enzyme lysozyme in 1923 and the antibiotic substance penicillin from the mould Penicillium notatum in 1928, for which he shared the Nobel Prize in Physiology or Medicine in 1945 with Howard Florey and Ernst Boris Chain.
He identified the mould as being from the Penicillium genus, and, after some months of calling it " mould juice ", named the substance it released penicillin on 7 March 1929.
Nicaea was convoked by Constantine I in May – August 325 to address the Arian position that Jesus of Nazareth is of a distinct substance from the Father.
Agar or agar-agar is a gelatinous substance derived by boiling from a polysaccharide in red algae, where it accumulates in the cell walls of agarophyte and serves as the primary structural support for the algae's cell walls.
Oxidation is a chemical reaction that transfers electrons or hydrogen from a substance to an oxidizing agent.
In a single sentence, parallel to Aristotle's statement asserting that being is substance, St. Thomas pushes away from the Aristotelian doctrine: " Being is not a genus, since it is not predicated univocally but only analogically.
The properties of the resulting substance resembled that of an intermediate of chlorine and iodine ; with those results he tried to prove that the substance was iodine monochloride ( ICl ), but after failing to do so he was sure that he had found a new element and named it muride, derived from the Latin word muria for brine.
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