Sunday, September 07, 2014

What's that in old money?

Have you ever wondered, as I have, why in the Fahrenheit scale, the freezing point of water is 32°? Funny number, as is 212° for boiling point.  How did he come up with that?  And it appears that the scale was not originally based on the various states of water at all and these numbers were simply later calculations.  He based his scale on the freezing point of brine (mixture of water and salt) which he set at 0° and the temperature of the healthy human body, which he set at 96°.  Why 96? Because it's a multiple of 12 - we're so used today to working in 10s but in fact 12 is a far more useful base to work in because 12 is equally divisible by 2, 3, 4 and 6, whereas 10 is equally divisible by only 2 and 5.  Those of an age will remember that the pre-decimal shilling was made up of 12 pence and very useful it was for dividing pocket money between multiple children.  And on this 0-96 scale the freezing point of water came out as 32 and the boiling point 212 - and there you are.

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