-=> Quoting Jasen Betts to Leonard Erickson <=-

 JB>> 16-May-04 08:12:46, Tom Walker wrote to Pascal Schmidt
 LE> ->  TW> I suspect you are laughing as you listen the
"Amercians"
 JB>> complain ->  TW> about Gasoline approaching $2.50 per US Gallon.
 JB>> :-) :-) -> Wrong tree. While I have a driver's license, I don't
 JB>> own a car and don't
 TW>> pla -> to. Also I can't compare the price as I don't have the
 TW>> faintest idea of how -> much a gallon is. ;)
 TW>> One US Gallon is 3.78541 Ltrs
 
 JB>> hmm, that's 231 cubic inches should be a US gallon Oddly world
 JB>> book dictionary also says 3.7853 ltr
 
 LE> CRC handbook of physics and chemistry says 3.785412. I'd trust it.
 LE> The dictionary is wrong.

 JB> OK. The Rubber Bible: I resect that source.
 
 LE> A gallon is *defined* as 231 cubic inches.

 JB> interesting definition, I wonder how that came about.
 
 LE>  An inch is *defined* as 2.54 cm (really!)

 JB> Is is now.  I have somewhere a reference to a 2.539... cm inch.
 
 LE> 231 * 2.54^3 = 3785.411784 cm^3 = 3.785411784 liters.

 JB> BTW can you tell me a pint (us) is a pound of what?
 
The rule of thumb is that a us pint is about a pound of water.

There are 8 pints to a gallon, so 1 pint = 0.4731765 liters
That's 473.1765 cc. A cc of water weigh a gram (close enough for our
purposes) 

A pound is 453.5924 grams.

So a pint of water weighs about 1.043 pounds. 

For a rule of thuimb, 4% error is good enough. 
 
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