Homebrew PCBs

Something isn't quite right here ...

> Also "a pint of water weighs a pound and a quarter" (Standard rhyme
which
> used to be memorised by all school children) so 20 fluid ounces of
water
> (1 pint) weighs 16 ounces Av.

If a pint of water weighs 16 ounces and that is a pound and a quarter, a
pound must equal 12.8 ounces. According to my conversion program:

  1 UK pint = 20 UK fluid ounces
  1 US pint = 16 US fluid ounces

  1 UK pint = 1.2 US pint

  1 pound = 16 ounces 

Now, "a pint of water weighs a pound and a quarter" ... a pound and a
quarter is 20 ounces and, a UK pint is 20 fluid ounces ... ! ... ?

Using the conversion program again:

  1 UK fluid ounce = 0.02841307 liters

  1 US fluid ounce = 0.02957353 liters

and

  1 ounce = 0.02834952 kilograms

so, assuming that 1 liter of water weights 1 kilogram, one UK fluid
ounce will weigh about 1 ounce!

Am I missing something?