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Metric equivalents are based upon one of two nearly equivalent systems. In the standard system the conversion is that 1 gallon = 231 cubic inches and 1 inch = 2.54 cm, which makes a gallon = 3785.411784 millilitres exactly.
Dry measures are units of volume to measure bulk commodities that are not fluids and that were typically shipped and sold in standardized containers such as barrels.They have largely been replaced by the units used for measuring volumes in the metric system and liquid volumes in the imperial system but are still used for some commodities in the US customary system.
dry measure: US dry barrel: USdrybbl US dry bbl 105/32 US bsh 1.0 US dry bbl (0.12 m 3) U.S.drybbl U.S. dry bbl US bushel: USbsh US bsh 2150.42 cubic inches by definition 1.0 US bsh (35 L; 8.0 US dry gal; 7.8 imp gal) U.S.bsh U.S. bsh US bushel: USbu US bu 2150.42 cubic inches by definition
In Scotland, the peck was used as a dry measure until the introduction of imperial units as a result of the Weights and Measures Act 1824.The peck was equal to about 9 litres (1.98 Imp gal) (in the case of certain crops, such as wheat, peas, beans and meal) and about 13 litres (2.86 Imp gal) (in the case of barley, oats and malt).
Due to the canceling of uniform weight units, the baker may employ any desired system of measurement (metric or avoirdupois, [16] etc.) when using a baker's percentage to determine an ingredient's weight. Generally, the baker finds it easiest to use the system of measurement that is present on the available tools.
Conversion of units is the conversion of the unit of measurement in which a quantity is expressed, typically through a multiplicative conversion factor that changes the unit without changing the quantity. This is also often loosely taken to include replacement of a quantity with a corresponding quantity that describes the same physical property.
A coomb is a measure of volume.Its exact original details are not known. In 13th century England it was defined as 4 bushels (~140 L). It was in use in Norfolk as a dry measure: "Ben sold my Wheat to the Marlingford Miller this Morning for 19 shillings per Coomb" - Parson Woodforde's Diary, 20 May 1786.
Conversions between units in the metric system are defined by their prefixes (for example, 1 kilogram = 1000 grams, 1 milligram = 0.001 grams) and are thus not listed in this article. Exceptions are made if the unit is commonly known by another name (for example, 1 micron = 10 −6 metre).