紫(zi)銅(tong)(tong)(tong)又名(ming)紅銅(tong)(tong)(tong)就是銅(tong)(tong)(tong)單質(zhi)(zhi)，因其(qi)(qi)顏(yan)色為(wei)紫(zi)紅色而得(de)名(ming)。各種性質(zhi)(zhi)見(jian)銅(tong)(tong)(tong)。紫(zi)銅(tong)(tong)(tong)是工業純銅(tong)(tong)(tong)，其(qi)(qi)熔點(dian)為(wei)1083℃，無同(tong)素異構轉變，相對密(mi)度(du)為(wei)8.9，為(wei)鎂的(de)(de)五倍。同(tong)體積的(de)(de)質(zhi)(zhi)量比普通鋼(gang)重約(yue)15%。因其(qi)(qi)具有玫(mei)瑰紅色，表面形成氧化(hua)膜后呈紫(zi)色，故一般(ban)稱(cheng)為(wei)紫(zi)銅(tong)(tong)(tong)。它是含(han)(han)有一定(ding)氧的(de)(de)銅(tong)(tong)(tong)，因而又稱(cheng)含(han)(han)氧銅(tong)(tong)(tong)。