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The imperial gallon was originally defined as 10 pounds (4.5359 kg) of water in 1824, and refined as exactly 4.54609 litres in 1985. Traditionally, when describing volumes, recipes commonly give measurements in the following units: Tumbler (10 fluid ounces; [29] [30] named after a typical drinking glass)
In traditional Jewish standards of measurement, the omer was equivalent to the volume of 43.2 chicken's eggs, or what is also known as one-tenth of an ephah (three seahs). [6] In dry weight, the omer weighed between 1.56–1.77 kg (3.4–3.9 lb), being the quantity of flour required to separate therefrom the dough offering. [7]
For example, in a recipe that calls for 10 pounds of flour and 5 pounds of water, the corresponding baker's percentages are 100% for the flour and 50% for the water. Because these percentages are stated with respect to the weight of flour rather than with respect to the weight of all ingredients, the sum of these percentages always exceeds 100%.
The tonne (t) is an SI-compatible unit of mass equal to a megagram (Mg), or 10 3 kg. The unit is in common use for masses above about 10 3 kg and is often used with SI prefixes. For example, a gigagram ( Gg ) or 10 9 g is 10 3 tonnes, commonly called a kilotonne .
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).
Other uses in the US include the measurement by volume of salt, where one sack is 215 pounds (98 kg), cotton where one sack is 140 pounds (63.5 kg) and flour, where one sack is just 100 pounds (45.4 kg). [9] It has also been used as a measure of volume for dry goods in Britain, with one sack being equivalent to 15 imperial gallons (68 L). [10]
The kilogram, symbol kg, is the SI unit of mass. It is defined by taking the fixed numerical value of the Planck constant h to be 6.626 070 15 × 10 −34 when expressed in the unit J⋅s, which is equal to kg⋅m 2 ⋅s −1, where the metre and the second are defined in terms of c and Δν Cs. —
The se'ah or seah (Hebrew: סאה sə’āh), plural se'im, is a unit of dry measure of ancient origin found in the Bible and in Halakha (Jewish law), which equals one third of an ephah, or bath.