Commodity Units


The standard 
barrel of crude oil or other petroleum product (abbreviated bbl) is 42 US gallons (34.9723 imp gal; 158.9873 L). This measurement originated in the earlyPennsylvania oil fields, and permitted both British and American merchants to refer to the same unit, based on the old English wine measure, the tierce.

Troy Ounce

The troy ounce (ozt) is a unit of imperial measure. In the present day it is most commonly used to gauge the weight of precious metals. One troy ounce nowadays defined as exactly 0.0311034768 kg =31.1034768 g. There are ca. 32.1507466 troy oz in 1 kg. One troy ounce is equivalent to ca. 1.09714 avoirdupois ounces.

British Thermal Unit (Btu)

The British thermal unit (symbol BTU or Btu) is a traditional unit of energy equal to about 1055 joules. It is approximately the amount of energy needed to heat 1 pound (0.454 kg) of water (i.e. exactly one tenth of a UK gallon, or around 0.1198 US gallons) from 39 to 40 ° F (3.8 to 4.4° C).[1]


The pound or pound-mass (abbreviations: lblbmlbm[1] ) is a unit of mass used in the imperialUnited States customary and other systems of measurement. A number of different definitions have been used, the most common today being the international avoirdupois pound which is legally defined as exactly 0.4535923kilograms.


The gallon is a measure of volume. Historically it has had many different definitions, but there are three definitions in current use. There is the imperial gallon (≈ 4.546 l) which is used in the United Kingdom[1] and is in semi-official use within Canada.[2] In United States customary units there are the liquid (≈ 3.79 l) and the lesser used dry gallons (≈ 4.40 l).