Use iron man has a long history.Metal ores are widely distributed.The content of iron in the Earth's crust is 4.1 percent, that is, in this parameter, it is in second place among the metals and fourth among all the elements.It is not surprising that even before our era (II millennium) was found by the method of its preparation and processing.In the future, improved technology opens up new methods of producing iron, and gradually the metal has become a leader in the production of goods.
value of iron is not limited to the field of material production.It is as a trace element is part of hemoglobin - the red color of our blood is due to the presence of iron in it.Iron is essential for normal growth and development of plants, it is involved in oxidative processes and is part of the protoplasm.
Any substance including iron, has its own characteristics.If you put on the scale of one kilogram of metal, and one kilogram of lint, the weight they will be the same, only the volume at the same time they will occupy entirely incomparable.The fact is that the density of iron is much more than the fluff.Under density realize mass contained in a unit volume.Each material has its own density.In water, for example, a thousand kilograms / cubic meter of ice - nine kilograms / cubic meter.
density determined as the ratio of mass to volume occupied.On density affects several factors.Thus, it depends on temperature.For many substances, the following relationship is valid: the temperature decreases the density increases with increasing - decreasing.However, this rule a few exceptions, and one of them - water.Here, the opposite is true, as the temperature decreases its density decreases.
With this exclusion in the world is life.Ice is lighter than water, and it rests on the surface.Otherwise, he sank to the bottom, lay there and did not melt.And over time, the seas and oceans would freeze completely.It turns out that the concept of density of materials allows us to very interesting conclusion about the possibility of life on Earth.
density largely depends on the chemical composition of the substance.Maximum effect on the density of iron having silicon and carbon.They lower the density of pure iron component 7800 kg / cubic meter at room temperature.At the same time, the carbon content of the iron dependent properties.In fact, iron is used in alloys, especially with carbon - in a variety of steel and iron.
typically contains more iron, 2.14 percent carbon, the carbon content in steel - a lower (0.8-1%).The density of the iron in these cases will be different.The solid cast iron has a density of 7000-7200 kg / cubic meter at ordinary temperature, the steel under the same conditions has a density of 7500-7600 kg / cubic meter.Thus, the density of steel is located between the iron and iron.
Its characteristics iron is brittle: If it hit, it breaks.Steel is obtained by processing the iron in the BOF.With this processing the carbon content is reduced, it is said to have burned.The properties of the steel is very different from cast iron.It can be forged, rolled to produce.Additional steel acquires properties through additives to give it the desired characteristics - strength, flexibility, hardness.
In the material considered such a thing as the density of iron.The features of changes in the density of certain substances under different external conditions.We consider separately the properties of iron and its importance in the production of goods, as well as trace elements in the body.
