Copper is a chemical element with the symbol Cu (from ) and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure copper has a pinkish-orange color. Copper is used as a conductor of heat and electricity, as a building material, and as a constituent of various metal alloys, such as sterling silver used in jewelry, cupronickel used to make marine hardware and coins, and constantan used in strain gauges and thermocouples for temperature measurement. Copper is one of the few metals that can occur in nature in a directly usable metallic form (native metals). This led to very early human use in several regions, from . Thousands of years later, it was the first metal to be smelted from sulfide ores, ; the first metal to be cast into a shape in a mold, ; and the first metal to be purposely alloyed with another metal, tin, to create bronze, . In the Roman era, copper was mined principally on Cyprus, the origin of the name of the metal, from aes cyprium (metal of Cyprus), later corrupted to (Latin). (Old English) and copper were derived from this, the later spelling first used around 1530. Commonly encountered compounds are copper(II) salts, which often impart blue or green colors to such minerals as azurite, malachite, and turquoise, and have been used widely and historically as pigments.

From Wikipedia (CC BY-SA 4.0).

Notable quotes

“The world is an old woman, and mistakes any gilt farthing for a gold coin; whereby being often cheated, she will thenceforth trust nothing but the common copper.”
— Thomas Carlyle, in Blackwood's Magazine, Vol. 85 (1859), p. 131.
“God has made us to be conduits of his grace. The danger is in thinking the conduit should be lined with gold. It shouldn't. Copper will do.”
— John Piper, as quoted in in Kevin Cross Embezzlement: A True Crime Story (Bridge Logos Foundation, 2010)
“Instead of the copper I shall bring in gold, and instead of the iron I shall bring in silver, and instead of the wood, copper, and instead of the stones, iron; and I will appoint peace as your overseers and righteousness as your task assigners.”
— Isaiah 60:17 (NWT)
“His feet were like fine copper when glowing in a furnace; and his voice was as the sound of many waters.”
— Revelation 1:15 (NWT), although the metal has also been translated as "bronze" or "brass"

Quotes via Wikiquote (CC BY-SA), each with its original source.

Notable quotes

“The world is an old woman, and mistakes any gilt farthing for a gold coin; whereby being often cheated, she will thenceforth trust nothing but the common copper.”
— Thomas Carlyle, in Blackwood's Magazine, Vol. 85 (1859), p. 131.
“God has made us to be conduits of his grace. The danger is in thinking the conduit should be lined with gold. It shouldn't. Copper will do.”
— John Piper, as quoted in in Kevin Cross Embezzlement: A True Crime Story (Bridge Logos Foundation, 2010)
“Instead of the copper I shall bring in gold, and instead of the iron I shall bring in silver, and instead of the wood, copper, and instead of the stones, iron; and I will appoint peace as your overseers and righteousness as your task assigners.”
— Isaiah 60:17 (NWT)
“His feet were like fine copper when glowing in a furnace; and his voice was as the sound of many waters.”
— Revelation 1:15 (NWT), although the metal has also been translated as "bronze" or "brass"

Quotes via Wikiquote (CC BY-SA), each with its original source.

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Copper is a chemical element with the symbol Cu (from ) and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure copper has a pinkish-orange color. Copper is used as a conductor of heat and electricity, as a building material, and as a constituent of various metal alloys, such as sterling silver used in jewelry, cupronickel used to make marine hardware and coins, and constantan used in strain gauges and thermocouples for temperature measurement.

Overview

Copper is a chemical element with the symbol Cu (from ) and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure copper has a pinkish-orange color. Copper is used as a conductor of heat and electricity, as a building material, and as a constituent of various metal alloys, such as sterling silver used in jewelry, cupronickel used to make marine hardware and coins, and constantan used in strain gauges and thermocouples for temperature measurement. Copper is one of the few metals that can occur in nature in a directly usable metallic form (native metals). This led to very early human use in several regions, from . Thousands of years later, it was the first metal to be smelted from sulfide ores, ; the first metal to be cast into a shape in a mold, ; and the first metal to be purposely alloyed with another metal, tin, to create bronze, . In the Roman era, copper was mined principally on Cyprus, the origin of the name of the metal, from aes cyprium (metal of Cyprus), later corrupted to (Latin). (Old English) and copper were derived from this, the later spelling first used around 1530. Commonly encountered compounds are copper(II) salts, which often impart blue or green colors to such minerals as azurite, malachite, and turquoise, and have been used widely and historically as pigments.

From Wikipedia (CC BY-SA 4.0).

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