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American measures

The main differences between the British measures and the American measures are observed as regards to the wet volumes and fluid ounces.

From many points of view, the American measures and weight are the same as the measure in the UK, but after a close look there are notable differences.

Differences between American and British measures

The main difference is in the use of gallon and therefore the used of other liquid measures like fluid, pint or ounce as also different. Likewise, the ton and hundredweight and not the same either since dry measures exist like the bushel.

Even if some think that the American distance/length is different from the British ones, this conception is false. From this point of view, the distance/length is the same in both cases.

Some time ago, the British gallon was different in terms of what it was needed to be measured and where the measuring took place. This was a rather difficult situation until the 19th century two separate definitions appeared: the Wine gallon (Queen Anne gallon) for 231 cubic inches and the Ale gallon (Winchester gallon) of 282 cubic inches.

Some time later during the 18th century, the British people decided to abandon the Wine and Winchester gallon to replace it with the Imperial gallon which was based on a water volume of 10 pounds.
However, America had decided to standardize the Wine gallon. In this way, the American gallon is approximately 83% of the British one.

Another difference is regarding the measure for other liquids. The American measures include 4 quarts, 32 gills, and 8 pints in a gallon and these are clearly smaller than the British measures.

While in the US there are 16 fluid ounces in a pint, the British include 20 fluid ounces. In other words, the American fluid ounce is significantly greater than the British one with approximately 4%.
The British system uses a gallon of water which has a weight of 10lbs (160 ounces) and based on this fact many other conclusions can be drawn. The water ounce weights exactly one ounce.

In case of dry volumes, the Imperial gallon system offers the possibility to use gallon for both liquids and dry measures, case in which 1 bushel equals 8 gallons. But, the American system treats these two measures separately.
Surprisingly, for dry measures the American system decided to use the Winchester British Bushel.

In conclusion, there are many differences between the American and British systems for measuring volumes. Not only the gallons are different, but also the fluid ounce, pints and bushels.

It is important to be aware of these differences and know how to apply them since all pewter vessels should be measured once purchased.

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