Warp wrote:
>   Another question:
> 
>   Is there a reason that 1 gallon is exactly 231 cubic inches? Was a gallon
> first defined in terms of cubic inches? (And why such an arbitrary number
> as 231?)
> 
>   Why no such round number with cubic feet? 1 gallon = 0.133680556 cubic feet.
> 

Remembering that I use imperial measures. One gallon of water was 
defined as weighing 10 lb of water at STP (Standard Temperature and 
Pressure).

-- 

Best Regards,
	Stephen

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