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铅是人类较早提炼出来的金属之一,炼铅术和炼铜术几乎同时诞生。铅的化学符号为Pb,来源于希腊字。铅是软金属,易于加工,并能抗腐蚀,它在相当低的温度下——327.5℃就能溶化,因此很容易使它液化。当铅灌到铸模中或管子接头周围时,铅不因冷却而收缩,因此是理想的密封剂。然而,铅也是种很危险的有毒金属。遗憾的是,铅为人类服务了数千年之久,对人类造成的损害,已是难以尽述。
Lead is one of the earliest metals extracted from mankind. Lead smelting and copper smelting were born almost simultaneously. The chemical symbol of lead is Pb, derived from the Greek word. Lead is a soft metal, easy to process, and resistant to corrosion. It is capable of melting at a very low temperature of -327.5 ° C, making it easy to liquefy. When lead is poured into molds or around pipe joints, lead does not shrink due to cooling and is therefore an ideal sealant. However, lead is also a very dangerous poisonous metal. Unfortunately, lead has been serving humankind for thousands of years, causing damage to human beings that are hard to explain.