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‡ In Canada, a cup was historically 8 imperial fluid ounces (227 mL) but could also refer to 10 imperial fl oz (284 mL), as in Britain, and even a metric cup of 250 mL. Serving sizes on nutrition labelling on food packages in Canada employ the metric cup of 250 mL, with nutrition labelling in the US using a cup of 240 mL, based on the US ...
A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or submultiple of the unit. All metric prefixes used today are decadic.Each prefix has a unique symbol that is prepended to any unit symbol.
Metric units are units based on the metre, gram or second and decimal (power of ten) multiples or sub-multiples of these. According to Schadow and McDonald, [1] metric units, in general, are those units "defined 'in the spirit' of the metric system, that emerged in late 18th century France and was rapidly adopted by scientists and engineers.
An imperial fluid ounce is 1 ⁄ 20 of an imperial pint, 1 ⁄ 160 of an imperial gallon or exactly 28.4130625 mL. A US customary fluid ounce is 1 ⁄ 16 of a US liquid pint and 1 ⁄ 128 of a US liquid gallon or exactly 29.5735295625 mL, making it about 4.08% larger than the imperial fluid ounce. A US food labeling fluid ounce is exactly 30 mL.
For example, a length that is significantly longer or shorter than 1 metre can be represented in units that are a power of 10 or 1000 metres. This differs from many older systems in which the ratio of different units varied. For example, 12 inches is one foot, but the larger unit in the same system, the mile is not a power of 12 feet. It is ...
1 fluidrachm or 4 mL, [11] or 3.75 mL [18] (actual range: 4.6–5.5 mL [12]) 1 ⁄ 3 tablespoon or 1 ⁄ 6 fl oz 1 fl dram or 5 mL, [13] 1 ⁄ 6 fl oz, [15] 1 1 ⁄ 3 fl dr 1 ⁄ 8: 2 teaspoons = 1 dessertspoon dessertspoon: dsp., dssp. or dstspn. 2 fluid drams or 10 mL [10] most common size: 2 1 ⁄ 2 fl dr or 10 mL [17] 2 fluidrachm or 8 mL ...
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the statistical confidence interval or tolerance interval of the initial measurement; the number of significant figures of the measurement; the intended use of the measurement, including the engineering tolerances; historical definitions of the units and their derivatives used in old measurements; e.g., international foot vs. US survey foot.