Silver used for photography

Silver

Silver chemical element with the symbol Ag and atomic number 47 in the periodic table of elements.
Silver precious metal, white color, a precious metal known since ancient times as defined by the ancient Egyptians, Arabs and Chinese and used in jewelery industry and in medicine and disease prevention. It is used in the Minting In completely ornaments such as gold industry, but it is less valuable.

Silver element

Is an element symbolized by the letters Ag acronym for the word «Orzintm» (Latin: Argentum) and attributed to him the State of Argentina (silver land), where they found silver in abundance. And it is one of the relatively precious elements.

Silver found in nature in several forms, including pure metal in Norway and Canada – and Peru in the form of metal Alarzinat Ag2S- and in the form of silver chloride as in Mexico and Canada, there is usually mixed with other metals such as gold, copper and lead.

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White metal to a high degree of luster can be polished and highly polished. With the exception of gold, the silver of the most ductile metals and roads. In terms of delivery of heat and electricity, it is superior to all other metals, ranging in hardness between 2.5 and 2.7 Mohs scale of hardness, where it is more than gold, but the softest of copper. The silver metal in the transitional Group No. (II) of the periodic table, atomic, number (47), and atomic weight of 107.868, and has a specific weight of 10.5. Fused silver at a temperature of (962) degrees Celsius. And up to the boiling point at a temperature of (2212) degrees Celsius.

Silver properties

Free silver found in nature as there are in the form of raw materials, notably crude silver sulfide, and silver chloride. As silver and arsenic found in Alantamon ores, often copper, zinc and lead ores containing silver metal. And that a large part of the silver behind a presentation elements when mining ores that we mentioned above. And silver metals are all higher than in its ability to heat and electrical plug and lags behind only gold in the usability of roads and clouds, in any sheet tortillas very high-wire act.

And fused silver at a temperature (960 ° C), if heated in a vacuum, or in an atmosphere of nitrogen, and fused into the air at a temperature (923 ° C), so as to dissolved oxygen from the air, and increases the melting of oxygen in the molten silver higher the score the molten heat In temperature (973) dissolves per cubic centimeter of molten silver (20.3) cubic centimeters of oxygen and silver melt (RFID) in nitric acid, the center of it and composed diluted silver nitrate. It also affected by sulfuric acid in the hot place to be Kipritdat silver but they hold up in the face of hydrochloric acid and alkali.

Date of silver metal

I have known since antiquity silver as decorative metal values ​​it is also used as currency, where several mines in Asia Minor was held before the year 2500 BC solutions. In the Islamic Ages silver used in making pots and coins. And indicates the Peronist in the fourth century AH / tenth the AD to the existence of mixed silver with gold, not mixed with it and it seems that he intended mixing Union between elements of the confusion is the blending do we mean in the present time in chemistry, he says in his book Aljmaher: “In the village and Sinanh near Zroban found At times iron mixed with silver and it was not mingled flake is characterized by the non-dissolved, it found the piece of pure silver in iron metal cut and divided the secret. ” It is the chemical point of view, silver is not hyperactive minerals. Silver does not dissolve in dilute acids and in alkalis but insoluble in nitric acid or sulfuric acid Center, which does not react with oxygen or water at normal temperatures. And attack each of sulfur and silver sulfide, silver may lose its luster due to be silver sulfide on the surface of the metal. The bleach that contains a reasonable amount of sulfur as a component of proteins-silver loses its luster very quickly. It also loses its luster small amounts of sulfides that exist naturally in the atmosphere, which is added to the gas used in homes, such as hydrogen sulfide. The black silver sulfide from more salts insoluble in aqueous solutions, and take advantage of this feature in the separation of silver ions from other positive ions.

Uses

Use old

Due to the ability of high silver to kill bacteria and microorganisms and algae Arabs used in water purification, where the water placed in the proximity made from the skin of a sheep and fills nearly three-quarters with water and the remaining air and placed in the water, metal pieces of silver coins and during a long flight distances vibrating Bagpipes Vtank the pieces to each other, resulting in the melting of a small fraction of silver in the water in the form of ultra-soft powder leads to kill bacteria and disinfect the water.

Modern uses

1-Water Purification

Can be used silver newly in water purification, rather than using non-chlorine safe health, where studies have shown that the dose of silver in water purification less than one in a billion, equivalent to one milligram per cubic of water per square meter, which means that the cost of treatment up to about half penny Egyptian currency, while chlorine cost three pennies, along with risks to workers and the population of people around the chlorine gas, as recent studies have shown that chlorine is carcinogenic and causes abortion pregnant, prevents the adhesion of the embryo, where the wall of the uterus. From this point of silver can be used in the sterilization of other types of water, such as water used in power plants, water and sewage, and industrial cooling towers and water pools.

2-In medicine

Silver medical applications such as ointments industry, and currently is used silver in the treatment of foot diabetic patients, where they are set percentage of sugar in the body and the use of water baths genitive oxygen water and the restaurant ions silver, where the killing of contaminated microorganisms ulcers in the foot and then leave a light layer of silver based preventing the growth of any other objects.

Due to the ability of high silver to kill bacteria and microorganisms and algae Arabs used in water purification, where the water placed in the proximity made from the skin of a sheep and fills nearly three-quarters with water and the remaining air and placed in the water, metal pieces of silver coins and during a long flight distances vibrating Bagpipes Vtank the pieces to each other, resulting in the melting of a small fraction of silver in the water in the form of ultra-soft powder leads to kill bacteria and disinfect the water.

3-In mental illness

Recent studies have shown that for silver effect is mechanical known on the psychological state of the human being, and that is used in psychological medicine treatment in most of the drugs of the United States, also contribute to the prevention of serious diseases, so widespread in America now so-called Bmalq silver, a slushy by the many volumes of solution silver in the form of ultra-soft powder by up to about 500 mg per liter of silver, which is taken by mouth at a rate of one teaspoon per day.

4-Other uses

And used vehicles (Highgyen Selver) resistance in viruses and diseases in poultry and livestock farms, and also in the massacres of poultry meat in the packaged food factories, hospitals and factories bottled water. Silver is used in the production of many types of anti fabric of Bactariyawalverosat, for example shoes stench that produce them because they are confidential no ventilation her causing bacteria that smell caused by race and this could be some ions enter the silver made him Stocking permanently tissue or in the same tread.

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Originally posted 2019-05-16 07:23:50.

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