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الدهب

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The most common gold compounds are auric chloride and chlorauric acid, the latter being used in photography for toning the silver image. Gold has 18 isotopes; 198Au, with a half-life of 2.7 days, is used for treating cancer and other diseases. Disodium aurothiomalate is administered intramuscularly as a treatment for arthritis. A mixture of one part nitric acid with three of hydrochloric acid is called aqua regia (because it dissolved gold, the King of Metals). Gold is available commercially with a purity of 99.999+%. For many years the temperature assigned to the freezing point of gold has been 1063.0C; this has served as a calibration point for the International Temperature Scales (ITS-27 and ITS-48) and the International Practical Temperature Scale (IPTS-48). In 1968, a new International Practical Temperature Scale (IPTS-68) was adopted, which demands that the freezing point of gold be changed to 1064.43C. The specific gravity of gold has been found to vary considerably depending on temperature, how the metal is precipitated, and cold-worked.



مزيد من المعلومات حول الدهب

Welcome to Homeless Hounds

Our mission is to rescue and re-home, abandoned and abused dogs from the streets of Lancashire, giving them a second chance at a life filled with love and security. Your support is the vital lifeline to our success in giving these unfortunate dogs a new start in life. 

Jimbob needs a loving home

Jimbob has waited far too long for a sofa of his own

                  

Donate today

Homeless Hounds is funded entirely by fundraising efforts and public donations. All donations are gratefully received and you can be confident in the knowledge that every penny goes directly to helping dogs in our care, covering costs including emergency boarding facilities, veterinary treatments and transport costs. Thank you in advance. 

 Thank you for supporting Homeless Hounds

Source: http://www.homelesshounds.org.uk/?mikstyra=%D9%85%D8%AA%D9%89-%D9%8A%D8%B1%D8%AA%D9%81%D8%B9-%D8%B3%D8%B9%D8%B1-%D8%A7%D9%84%D8%B0%D9%87%D8%A8-%D9%88%D9%85%D8%AA%D9%89-%D9%8A%D9%86%D8%AE%D9%81%D8%B6&f68=07


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