UK or Imperial gallon is indeed around 20% bigger than a US gallon at 4.55
Litres compared to 3.78, but the weight of a gallon is dependant on the
density or SG of the liquid. So a UK gallon of water does weigh 10 lbs, but a
UK gallon of say IPA  with an SG of 0.8 will weigh 8lbs and so on.

I have no idea why the US got a smaller gallon, everything is supposed to be
bigger in the USA.

ps: Don't US suppliers still give the weight in lbs per (US) gallon for their
products on their data sheets?
..............

In a message dated 14/01/99  10:02:22PM, you write:

> Don't forget a UK gallon is different to an American Gallon.
>
>  1 UK gallon weighs 10 lbs.
>
>  calculation is then  vol x 10 x sg.
>
>  Jim Douglas
>
>  ----------
>  From:   Gang Zhao
>  Sent:   14 January 1999 20:40
>  To:     [log in to unmask]
>  Subject:        Re: [TN] conversion
>
>
Weight, lbs = (Vol, gal) x 3785 x (Specific Gravity) / 454
>
>
>
>  -----Original Message-----
>  From: TechNet [mailto:[log in to unmask]]On Behalf Of Todd Vorpahl
>  Sent: Thursday, January 14, 1999 11:42 AM
>  To: [log in to unmask]
>  Subject: [TN] conversion
>
>
>  Hi all,
>
>  Could anyone (not everyone) give me the math to convert from volume
>  (gallons) to
>  weight (lbs.) given the specfic gravity of a material?
>
>  thanks
>

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