Natural copper very plastic and malleable material. But, at the same time, it differs in high durability. This metal added to alloys increases their resistance to attrition. Copper has a number of characteristic properties on which it can be distinguished from other metals.
It is required to you
- Copper wire, product from bronze, hot water, table salt, a steel core, the heat conductivity measuring instrument, the gas burner, drinking water
Instruction
1. Copper has characteristic reddish-pink color. This metal surpasses all others in the plasticity. It is easy to bend a copper wire even hands.
2. It is very important to be able to distinguish copper from bronze. For this purpose it is necessary to smooth out a copper wire and to lower it in hot salty water for 5 minutes. Most it is necessary to make also with an estimated product of bronze. After influence of hot hydrochloric solution, copper will get more dark shade.
3. If to leave a copper wire under the open sky for long time, then it is possible to observe how it will change. Copper has own protective property. At long influence of the atmospheric phenomena, it becomes covered by a protective film of greenish color - patina. The film preserves copper against corrosion.
4. In comparison with steel, copper has higher heat conductivity. In order that to see it, it is necessary to heat a copper wire and a steel core. Then it is necessary to estimate results by means of the heat conductivity measuring instrument.
5. When heating in the open air, copper changes the color. If to heat a copper wire over the gas burner on air, at first it will grow dull. Then copper will darken, before acquisition of black color.
6. If in drinking water there is a lot of copper, then water has the expressed metal taste is bright. The excess of copper defines such organoleptic properties N2O.Takaya water is noxious to health as copper in large numbers - is toxic. Skillfully using properties of copper, it is possible to apply it in different areas.