Question

iron glows in red colour when it is heated to very high temperature. the reason for this???​

Answer 1

Answer:

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Explanation:

Red-short, hot-short refers to brittleness of steels at red-hot temperatures. It is often caused by high sulfur levels, in which case it is also known as sulfur embrittlement.

Iron or steel, when heated to above 900 °F (460 °C), glows with a red color. The color of heated iron changes predictably (due to black-body radiation) from dull red through orange and yellow to white, and can be a useful indicator of its temperature. Good quality iron or steel at and above this temperature becomes increasingly malleable and plastic. Iron or steel having too much sulfur, on the other hand, becomes crumbly and brittle. This is due to the sulfur forming iron sulfide/iron mixtures in the grain boundaries of the metal which have a lower melting point than the steel.[1]

When the steel is heated up and worked, the mechanical energy added to the workpiece increases the temperature further. The iron sulfide (FeS) or iron/iron sulfide alloy (which has an even lower melting point)[2] begins to melt, and the steel starts to separate at the grain boundaries. Steelmakers add manganese (Mn) to the steel when it is produced, to form manganese sulfide (MnS). Manganese sulfide inclusions have a higher melting point and do not concentrate at the grain boundaries. Thus, when the steel is later heated up and worked, the melting at the grain boundaries does not occur.

Depending on current physical chemistry, iron rods due to its relative electro-positivity, compared to the high electronegativity of oxygen (the highest after fluorine and the noble gas (yes, the last ones have it)), where electronegative means an aptitude to get electrons from another substance (iron, here).

Doing this, the iron tends to be ionised; it does not dissolve in this polarised liquid which is water, due to its high metallic inner bonds, but as the rodded surface remains permeable to the oxygen, the oxydation continues.

-It become red when heated enough in presence of oxygen, as in incinerator, because it is even rapider oxidised than in salt water. Notice that it then remains magnetic, and can be filtered after the incineration, with magnets. Notice that the process is revertible, with an even higher temperature, in fusing, where the oxygen is released.

All that being written, I refuse to discuss about the colours in themselves, because the qualia cannot be defined with Cartesian ponderations (as frequencies), as every body knows for centuries.

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Answer 2

Answer:

Due to the heating effect ...............

...........

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