黄金是人类最早发现和利用的少数几种金属之一。黄金乃国库的“基石”。黄金首饰还是男女之间的定情之物。随着社会的发展,人类的进步,黄金首饰则更受女士们的垂青。黄金是黄而软的金属,比重虽大,硬度不大,熔点却高达1065℃,金的延展性和可锻性最高,可压成很薄的金叶,亦可拉成很细的金丝。(1克纯金可拉成直径为0.00434mm,长达 3.5km的细丝),金的导电率仅次于银、铜,为银的74%。黄金的用途很广,有“百金之王”的美称。主要用作货币和装饰品。还用于陶瓷、镶牙、金笔等行 Gold is one of the few metals discovered and utilized by mankind. Gold is the “cornerstone” of the treasury. Gold jewelry is still the same thing between men and women. With the social development, human progress, gold jewelry is even more favored by the ladies. Gold is yellow and soft metal, although the proportion of large, hardness is not, the melting point is as high as 1065 ℃, gold ductility and malleability of the highest, can be pressed into a thin gold leaf, can be pulled into very fine gold . (1 gram of pure gold can be drawn into a diameter of 0.00434mm, up to 3.5km of filaments), gold, second only to silver, copper, 74% of silver. The use of gold is very wide, there are “reputation of the king of 100% ”. Mainly used for currency and decorations. Also used in ceramics, denture, gold pen and other lines