There are quite a few differences, mostly in that the US units are smaller than the imperial ones with the same names:
*With respect to lengths:
There doesn't seem to be much difference except that in America when specifying fairly long distances less than a mile they use feet instead of yards (which is slightly shorter than the metre).
* With respect to volumes:
1 US pt = 16 US fl oz
1 imp pt = 20 imp fl oz
→ 1 US gal = 128 US fl oz
→ 1 imp gal = 160 imp fl oz
But note that 1 US fl oz ≈ 1.041 imp fl oz so the US pint and gallon are slightly larger than 4/5 the imperial pint and gallon.
* With respect to mass:
Not so much the system but convention is that in America weights are expressed in pounds whereas the UK uses stones and pounds (where 1 st = 14 lb).
With the ton:
the US system uses the short ton of 2000 lb,
but the imperial system uses the long ton of 2240 lb.
This leads to 1 hundredweight (cwt) being difference as 1 ton = 20 cwt in both systems:
1 US cwt = 1 short cwt = 100 lb
1 imp cwt = 1 long cwt = 112 lb (= 8 st)
The US system also uses the slug where 1 slug ≈ 32.174 lb; it is the mass that accelerates at 1 ft/s² when a 1 pound force is applied to it.
A metric ton (1 tonne) is 1000 kg ≈ 2205 lb which is a close approximation to the imperial ton.
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US system, or imperial system.
There are several different usages of the gallon. The US gallon is about 3.785 liters, so the difference between 3 liters and 1 US gallon is about 0.785 liters. The UK (Imperial) gallon is about 4.543 liters, so the difference between 3 liters and 1 UK gallon is about 1.543 liters.
No, temperature scale was not defined in the British Weights and Measures Act of 1824. Fahrenheit scale is part of "US Customary Units", which is based on the Imperial Units system, but differs in several minor ways.
Thirty-six inches is representative of the Imperial and US Customary Systems of Units.
1 metric tonne is 0.98419 long ton (UK imperial) or 1.1023113109 short ton (US). 1 metric tonne = 1000 kilograms 1 US short ton = 907.185 kilograms 1 UK long ton = 1016.05 kilograms