why does iron fillings burn vigorously although iron is a very less reactive metal and burns only on stron heating?

Asked by yogita choudhary | 18th Aug, 2012, 06:30: PM

Expert Answer:

The surface area to volume ratio is very high, total volume is very small, and iron is a good conductor of heat (and electricity.)

So, the good conductivity is able to transfer head from filing to filing and from surface of a filing to its interior much faster.

Therefore, small volume and large surface area to volume ratio exposes more of the filing to heat from the source of the burn, the heat at the surface penetrates the body of the filing very quickly.

Answered by  | 21st Aug, 2012, 10:13: AM

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