#Punch my good habits every day#
These days, I have written several articles about nostalgia, mood, landscape... The purpose of the article is to publicize my beautiful hometown for the outside world. Today I write some articles on my profession, popularizing the knowledge of gold.
Gold is called gold or gold, yellow can be brilliant, the value is very high, the public's eyes of gold, is gold bars, gold bricks, gold bracelets, gold necklaces... these are the naked eye can see the gold. The color of gold is golden yellow and difficult to decompose. Hardness 2-3, melting point 1064.4 °C; with good ductility, can be pressed into a thin foil, with extremely high heat transfer and conductivity, pure gold resistance of 2.4p. Pure gold has good chemical resistance and is the best plating material. Gold has good chemical stability, in the metal market gold and ruthenium, rhodium, palladium, osmium, iridium, platinum and other metals are collectively referred to as precious metals.
Gold is a very soft metal. The softness of the fingernails on pure gold makes gold very easy to process, but this is not ideal for the manufacturer of ornaments, because it is easy to rub the ornaments, make them lose their luster and even affect the appearance. Therefore, when making jewelry with gold, copper and silver are generally added to improve its hardness.
The steam emitted when gold is melted is green; its gold powder is usually brown during smelting; if it is cast into a thin sheet, it can transmit green light. Gold's ductility is unusually strong. 1 ounce of gold can be pulled up to 50 miles long, and its ductility makes it easy to cast, making it a good choice for jewelry. Gold is the most tensile of metals. Gold's malleability is second to none. Can result in extremely thin gold flakes that are easy to roll up. A 1 ounce of gold can be hammered to 4 millionths of a foot thick and 100 square feet in size. Ancients hammered it into thin slices to decorate the temples and palaces. These can all explain the extreme flexibility and malleability of gold.
As a precious metal, gold has good physical properties. "Real gold is not afraid of fire refining" means that gold is not easy to melt under the general flame. The density is large and the feel is heavy. Good toughness and ductility. Pure gold has a brilliant yellow color, but the color changes greatly after incorporation into other metals, such as dark red in gold-copper alloys and light yellow or off-white in silver-containing alloys. Gold is easily ground into a powder, which is why gold is scattered in nature, and pure gold jewelry is also easily worn and reduced in weight.
Gold is chemically stable, has strong corrosion resistance, and does not react with oxygen in air or even at high temperatures (except for pure oxygen under certain conditions). Gold does not react with oxygen and sulfur at high temperatures, and its chemical properties are very stable and stronger than silver (silver will oxidize at 1500 degrees to form silver oxide, and gold does not react with oxygen even at more than 3000 degrees). However, if this happens, gold will be oxidized - when aerobic is present at room temperature, gold is soluble in solutions containing potassium cyanide or sodium cyanide, forming a stable complex; gold can also be dissolved in solutions containing thiourea; and it is also soluble in acidic solutions with chlorine gas.
Rare large pieces of gold have ten kilograms to hundreds of kilograms, because some resemble dog heads, commonly known as dog head gold. These dog head gold are generally extremely pure and valuable.
Well, since it is a micro headline, the length should not be too long. When you (especially ladies) read this article, you may wish to untie your gold jewelry, and read the article while reading the jewelry, you will have a better understanding of the value of the jewelry you are carrying.
May all the ladies be even more radiant because they wear a gold jewelry!
