27 November 2006

Absalom's hair was heavy upon him

But in all Israel there was none to be so much praised as Absalom for his beauty: from the sole of his foot even to the crown of his head there was no blemish in him. And when he polled his head [cut his hair], (for it was at every year's end that he polled it: because the hair was heavy on him, therefore he polled it:) he weighed the hair of his head at two hundred shekels after the king's weight. 2 Samuel 14:25-26

Absalom was the best looking guy in all of Israel -- with one hell of a head of hair. He'd let it grow all year and then cut it, which he had to do each year because it got so darned heavy. One year's growth weighed 200 skekels.

And how heavy is 200 shekels? Well one shekel weighed about 11.5 grams. So Absalom's haircut trimmings weighed in at 2.3 kilograms.

How does this compare with normal human hair? Well, an average head hair has a diameter of about 0.01 cm (100 micrometers) and grows 12 cm per year. And an average head has about 100,000 hair follicles on it. If we assume that hair has a density of 1.5 g/cm3 (If anyone knows a better value, please let me know), we can estimate the weight of an average person's yearly hair production.

weight = pi * (.005 cm)2 * 12 cm * 100,000 hairs * 1.5 g/cm3 = 141 g

So an average person produces about 0.14 kilogram of hair annually -- less than 1/16th that of Absalom.

Of course Absalom wasn't an average person. He was, after all, the best looking guy in Israel. So maybe his hair was 20 times as thick or 20 times as dense as normal human hair. Or maybe the Bible was just making stuff up.

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