BarrelTroy OunceThe 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]}PoundThe pound or pound-mass (abbreviations: lb, lb, _{m}lbm, ℔^{[1]} ) is a unit of mass used in the imperial, United 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 0.45359237 kilograms.GallonThe 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). |