This article has multiple issues. Please help improve it or discuss these issues on the talk page . (Learn how and when to remove these messages)
|
The spread of metrication around the world in the last two centuries has been met with both support and opposition.[ where? ]
The United States of America officially accepted the Metric System in 1878 but United States customary units remain ubiquitous outside the science and technology sector. The metric system has been largely adopted in Canada and Ireland, and partially adopted in the United Kingdom and Hong Kong, without having fully displaced imperial units from all areas of life. In other Anglophone countries such as Australia, Singapore and New Zealand, imperial units have been formally deprecated and are no longer officially sanctioned for use. [1] [2]
One argument used by opponents of the metric system is that traditional systems of measurement were developed organically from actual use. [3] Early measures were human in scale, intuitive, and imprecise, as illustrated by still-current expressions such as a stone's throw, within earshot, a cartload or a handful. These measurements' developers, living and working in an era before modern science, gave fundamental priority to ease of learning and use; moreover, the variation permissible within these measurements allowed them to be relational and commensurable: a request for a judgment of measure allowed for a variety of answers, depending on context. In parts of Malaysia, villagers asked the distance to the next village were likely [4] to respond with three rice cookings; an approximation of the time it would take to travel there on foot. Everyone is assumed to know both how long it takes to cook rice, and how fast a person walks. Nominally standard units were also subject to contextual variations. The aune , a French ell used for measuring cloth, depended on the sort of cloth being measured, taking price and scarcity into account: an aune of silk was shorter than an aune of linen. [4]
Nowadays most non-metric units are standardised to fixed values, which eliminates the disadvantage of imprecision while retaining the advantage of human scale. For example, the advocacy group British Weights and Measures Association has argued that metrication led to greater complexity for consumers accustomed to imperial units because, unlike the ounce, a single gram is too small a measurement in everyday life. [5]
Metric opponents cite easier division of customary units as one reason not to adopt a decimalised system. For example, those customary units with ratios of 12 and 16 have more proper factors, {2, 3, 4, 6} and {2, 4, 8}, than the metric 10: {2, 5}. However, easily divisible numbers can be selected for use with metric units, e.g. 300 mm and its multiples. The number of times that these odd fractional numbers would come up has also been pointed out as a counterargument; in construction and engineering, for example, measurements would not only be likely to be in integers to begin with, but would also rarely be needed to convert to another unit.[ citation needed ]
The main disadvantage cited by critics of customary measures is the proliferation of units, their (sometimes) non-unique definition and the difficulty in remembering the ratios between them.[ citation needed ]
A common argument for the metric system is that it avoids duplication of naming and the associated confusion. The most commonly cited example is pound (force) vs pound (mass), which have the same symbol and are both commonly written simply as "pounds", which can lead to costly and dangerous shipping and engineering errors. Opponents of metrication argue that this issue only occurs due to misuse; when used 'properly', there is no cause for confusion.
Separately, it is also argued that customary units feature too many overlapping units. The most commonly cited examples are in liquid volume, where metric has simply litres while customary has gallons, pints, quarts, fluid ounces, and the rarely used gill, and minim, all of which cover volumes of liquid in similar ranges. Metrication opponents argue that this allows for easily listing amounts that are awkward in metric (e.g. 1 liquid pint = 568.3 mL in the UK and 473 mL in the US) but are commonly used and avoids "excessive" use of decimals and fractions. These problems however would disappear if metrication continues and they cease to become as common, replaced with a metric equivalent. For example, a pint is often rounded down to 0.5 L, otherwise sometimes rounded up to 0.6 L.
Metric opposed artisans and practitioners may be concerned by certain dimensions being less memorable with metric units. As the table below shows, industries have addressed such concerns by using a "hard conversion" into metric units of the dimensions involved. (Metric conversion also gives the opportunity to "Rationalize" the range of sizes which are available. [6] ):
Industry | Common reference | Metric reference |
---|---|---|
Carpentry | 4 ft × 8 ft plywood | 1219 mm × 2438 mm (exact) 1200 mm × 2400 mm (Europe) 2400 mm × 1200 mm (Australia/NZ - Largest value first) |
2" by 4" | 50.8 mm × 101.6 mm (exact - however planing makes the actual dimensions narrower.) 50 mm × 100 mm (Europe) (However, planing makes the actual dimensions 3~8 mm narrower) 90 mm × 45 mm (Australia/NZ - Accurate "rationalized" planed values are used, with the largest value first.) [7] |
Some industries, even in metric countries, have adopted industry standards which are not obviously multiples of metric units. One example of this is paper sizes: the widely used A series specification begins from A0, which has a surface area of 1 square metre, with sides in the ratio of approximately 1:√2 (841mm by 1189mm). This ratio has the unique property that when cut or folded in half widthways, the halves also have the same aspect ratio. Each ISO paper size is one half of the area of the next larger size in the same series. This means that A4 business letter paper is 1/16 m2 (0.0625 m2), yielding sides that are 210 mm × 297 mm.
Traditionalists consider the retention of traditional non-metric units as a form of traditionalism, valuing historic usage spanning centuries.
Non-metric units often have had different values in different times and places, and some units such as the stone even had different definitions depending on the type of object measured. At the time of the French Revolution there were over 5000 different foot measures. The current UK imperial system is based on the Weights and Measures Act 1824 (5 Geo. 4. c. 74), dating from about 30 years after the founding of the metric system, and some of its units differ very significantly from the United States customary units of the same name.
By contrast, the metric system has remained unchanged (for most practical purposes) since it was first defined. Even though the metre was initially defined to equal one ten-millionth of the length of the meridian through Paris from pole to the equator, the first prototype metre bar was subsequently found to be short by 0.2 millimetres (because researchers miscalculated the flattening of the Earth). Nevertheless, this original reference metre was retained, leaving the exact distance from equator to pole slightly more than ten million metres. The need for a more practical and reproducible definition of the metre and advances in metrology have led to increased precision in the definition, so that it is now defined as the length travelled by light in a vacuum during the time interval of 1⁄299,792,458 of a second. In addition, a reference standard (a rod of platinum-iridium alloy) is maintained by the inter-governmental organisation the International Bureau of Weights and Measures, and calibration of a standard metre is usually achieved (to one part in a billion, or slightly better in some recent installations) by counting 1,579,800.298728 wavelengths of the ultra-fine (3s2 to 2p4) emission line of helium–neon laser light (this wavelength being approximately 632.99139822 nm in a vacuum).
The adoption of metric units has required some government compulsion [8] and some have argued that such policies are wrong in principle. [9] Compulsory standards of weights and measures go back as far as Magna Carta. In 1824 in Britain, the Weights and Measures Act ("An Act for ascertaining and establishing Uniformity of Weights and Measures") consolidated the various gallons in use at the time and established a new imperial gallon, and prohibited the use of the older units, including what the United States now calls customary US measure.
Anti-metrication in the UK often manifests itself in conjunction with Euroscepticism, though the UK had taken steps toward compulsory metrication prior to European Union membership: in 1951, a Board of Trade committee unsuccessfully recommended metrication to the government, [10] ten years before the UK first applied to join the EEC. The Board of Trade initiated metrication in 1965, with a target completion date of 1975 [10] and the Metrication Board was established in 1968, [10] five years before the UK actually joined the European Economic Community (on its second attempt). The EU's own Units of Measurement Directive dated from 1971 and was substantially revised in 1979.
All Statutory Instruments about metrication since 1985 have relied on powers derived from the UK European Communities Act 1972. This helped to reinforce anti-EU sentiment, as the British Parliament does not vote on such measures. More recently, opponents of metrication have asserted that legal compulsion under the Weights and Measures Act 1985 to adopt the metric system instead of their traditional weights and measures is an infringement of the right to freedom of speech, though this claim has been consistently rejected by the courts. On 25 February 2004, the European Court of Human Rights rejected an application from some British shopkeepers who said that their human rights had been violated.
On 8 May 2007, several British newspapers including The Times [11] used correspondence between Giles Chichester MEP and EU Commissioner Günter Verheugen to report that the European Commission had decided to allow meat, fish, fruit and vegetables to continue to be sold in pounds and ounces. These reports did not mention that pounds and ounces would only retain supplementary unit status. On 10 September, the EU Commission published proposed amendments to the Units of Measurement Directive that would permit supplementary units (such as pounds and ounces) to be used indefinitely alongside, but not instead of, the units catalogued in the Units of Measurement Directive. The reporting of this decision in the British press was sufficiently misleading that the Roger Marles, Head of [British] Trading Standards, issued the following statement:
The legal position on the use of imperial measures has not changed. Pre-packed goods and goods sold loose from bulk, such as fruit and vegetables, are still required to be sold in metric quantities and weighing scales must be calibrated in metric units of measurement. Suggestions that goods can now be sold in pounds and ounces are incorrect. [12]
In the US, there is also government compulsion with weights and measures. Federal and state laws control the labelling of goods for sale in the supermarket, drugs, wine, liquor, etc. The US Fair Packaging and Labeling Act mandates that measurement must be in both metric and US customary units. [13] However, wine must be bottled in 50 ml, 100 ml, 187 ml, 375 ml, 500 ml, 750 ml, 1 litre, 1.5 litre, or 3 litre sizes. Containers over 3 litres must be bottled in quantities of whole numbers of litres. No other sizes may be bottled. [14] Spirits must also be sold in metric quantities. [15]
NASA, the United States' space agency, has taken a less compulsory approach. On 29 March 2010, NASA decided to avoid making its proposed Constellation rocket system metric-compliant, especially due to pressure from manufacturers; ultimately the program was discontinued. It had been predicted that it would cost US$368 million to convert to metric measurements for parts made by both NASA and external companies. Constellation would have borrowed technology from the 1970s-era Space Shuttle program, which used non-metric measurements in software and hardware. [16] NASA's non-compulsory position has contributed to at least one major mission-failure: in 1999, Lockheed Martin's use of English units caused the disintegration of NASA's $328 million Mars Climate Orbiter. [17] Despite NASA's non-compulsory policy, commercial space manufacturer SpaceX currently designs its systems (e.g., Dragon and Falcon 9) using metric units.[ citation needed ]
Commentator Ken Alder noted that on the eve of the French Revolution a quarter of a million different units of measure were in use in France; in many cases the quantity associated with each unit of measure differed from town to town and often from trade to trade. [18] He claimed that the metric system originated in the ideology of Pure Reason from the more radical element of the French Revolution, that it was devised in France to try to make France "revenue-rich, militarily potent, and easily administered", and that it was part of a conscious plan to transform French culture, meant to unify and transform French society: "As mathematics was the language of science, so would the metric system be the language of commerce and industry." [19] In his 1998 monograph Seeing Like a State: How Certain Schemes to Improve the Human Condition Have Failed, James C. Scott argued that central governments attempt to impose what he calls "legibility" on their subjects. Local customs concerning measurements, like local customs concerning patronymics, tend to come under severe pressure from bureaucrats. Scott's thesis is that in order for schemes to improve the human condition to succeed, they must take into account local conditions, and that the high-modernist ideologies of the 20th century have prevented this. Scott cites the enforcement of the metric system as a specific example of this sort of failed and resented "improvement" imposed by centralizing and standardizing authority. [20] While the metric system was introduced in the French law by the revolutionary government in April 1795, [21] it did not immediately displace traditional measurements in the popular mind. In fact, its use was initially associated with officialdom and elitism as François-René remarked in 1828: "Whenever you meet a fellow who, instead of talking arpents , toises , and pieds, refers to hectares, metres, and centimetres, rest assured, the man is a prefect." [22] However, it was largely used in France and in other countries by July 1837 when the decimal metric system was finally decided upon and considered the only official measurement system to be used in France.
The advocacy group British Weights and Measures Association argues that adopting metric measures in shops, especially in supermarkets, gives an opportunity for traders to increase prices covertly. They give numerous examples of packaged groceries to back up this contention. [23]
When Pepsi became the first in the United States to sell soft drinks in two-litre bottles [24] instead of two-quart (US) (1.89 litre) bottles, it was a success, and two-litre bottles are now well-established in the American soft drink market, [25] though fluid ounces remain the usual unit of measure for cans.
The move to smaller units (e.g., millilitre vs fluid ounce, gram vs ounce) allows manufacturers to move sizes of packaging up and down with more precision using whole numbers. For example, a 2-ounce bag of chips may be altered to 50 grams, then to 45 grams. Likewise, a variety of packaging sizes may arise, such as 690 grams (about 24 oz) or 1200 grams (about 42 oz), resulting from conversion and rounding of customary units. However, the precise adjustment of packaging sizes is also possible using customary units, e.g., the 2-ounce bag can be downsized to 1.8 and 1.6 ounces as well.
The Australian experience of metric conversion showed no evidence of price inflation caused by metrication. [26]
Abbreviation | BWMA |
---|---|
Formation | 1995 |
Type | Advocacy group |
Website | bwmaorg.uk |
The current British Weights and Measures Association, or BWMA, is an advocacy group established in the United Kingdom in 1995, founded by Vivian Linacre. [27] The current body was established in 1995, but there had also been a predecessor organisation, also called the BWMA, that was established in 1904, and lapsed after the First World War.
The BWMA's stated aim is to uphold the freedom to use the Imperial system and to oppose the compulsory imposition of the metric system in the UK. The BWMA's campaign parallels the evolution of the eurosceptic viewpoint of the UK's relationship with the EU [28] - its founder, Vivian Linacre, stood for election as a UK Independence Party candidate in 1995, the same year as he founded the BWMA - famously asking the controversial eurosceptic Enoch Powell for endorsement of his political campaign. [29]
By the time of the modern BWMA's founding, metrication in the United Kingdom was far advanced, having begun in 1962. British schoolchildren had been educated using only metric measures since 1974 (earlier in some places), and British industry had changed to using metric tools and equipment during the 1980s and were, in most cases, manufacturing to metric standards.
This article is missing information about what is the relationship of the named people with the Association, do they acknowledge/accept the honor or declare support for the BWMA?.(June 2019) |
The imperial system of units, imperial system or imperial units is the system of units first defined in the British Weights and Measures Act 1824 and continued to be developed through a series of Weights and Measures Acts and amendments.
The litre or liter is a metric unit of volume. It is equal to 1 cubic decimetre (dm3), 1000 cubic centimetres (cm3) or 0.001 cubic metres (m3). A cubic decimetre occupies a volume of 10 cm × 10 cm × 10 cm and is thus equal to one-thousandth of a cubic metre.
Metrication or metrification is the act or process of converting to the metric system of measurement. All over the world, countries have transitioned from local and traditional units of measurement to the metric system. This process began in France during the 1790s, and has persistently advanced over two centuries, accumulating into 95% of the world officially only using the modern metric system. Nonetheless, this also highlights that certain countries and sectors are either still transitioning or have chosen not to fully adopt the metric system.
The pound or pound-mass is a unit of mass used in both the British imperial and United States customary systems of measurement. Various definitions have been used; the most common today is the international avoirdupois pound, which is legally defined as exactly 0.45359237 kilograms, and which is divided into 16 avoirdupois ounces. The international standard symbol for the avoirdupois pound is lb; an alternative symbol is lbm, #, and ℔ or ″̶.
United States customary units form a system of measurement units commonly used in the United States and most U.S. territories, since being standardized and adopted in 1832. The United States customary system developed from English units that were in use in the British Empire before the U.S. became an independent country. The United Kingdom's system of measures evolved by 1824 to create the imperial system, which was officially adopted in 1826, changing the definitions of some of its units. Consequently, while many U.S. units are essentially similar to their imperial counterparts, there are noticeable differences between the systems.
In recipes, quantities of ingredients may be specified by mass, by volume, or by count.
The pint is a unit of volume or capacity in both the imperial and United States customary measurement systems. In both of those systems it is traditionally one eighth of a gallon. The British imperial pint is about 20% larger than the American pint because the two systems are defined differently. Almost all other countries have standardized on the metric system, so although some of them still also have traditional units called pints, the volume varies by regional custom.
A fluid ounce is a unit of volume typically used for measuring liquids. The British Imperial, the United States customary, and the United States food labeling fluid ounce are the three that are still in common use, although various definitions have been used throughout history.
Metrication is the process of introducing the International System of Units, also known as SI units or the metric system, to replace a jurisdiction's traditional measuring units. U.S. customary units have been defined in terms of metric units since the 19th century, and the SI has been the "preferred system of weights and measures for United States trade and commerce" since 1975 according to United States law. However, conversion was not mandatory and many industries chose not to convert, and U.S. customary units remain in common use in many industries as well as in governmental use. There is government policy and metric (SI) program to implement and assist with metrication, however there is major social resistance for further metrication.
Mesures usuelles were a French system of measurement introduced by French Emperor Napoleon I in 1812 to act as compromise between the metric system and traditional measurements. The system was restricted to use in the retail industry and continued in use until 1840, when the laws of measurement from 1795 and 1799 were reinstituted.
A system of units of measurement, also known as a system of units or system of measurement, is a collection of units of measurement and rules relating them to each other. Systems of measurement have historically been important, regulated and defined for the purposes of science and commerce. Instances in use include the International System of Units or SI, the British imperial system, and the United States customary system.
Metrication in Canada began in 1970 and ceased in 1985. While Canada has converted to the metric system for many purposes, there is still significant use of non-metric units and standards in many sectors of the Canadian economy and everyday life. This is mainly due to historical ties with the United Kingdom, the traditional use of the imperial system of measurement in Canada, interdependent supply chains with the United States, and opposition to metrication during the transition period.
Metrication in Australia effectively began in 1966 with the conversion to decimal currency under the auspices of the Decimal Currency Board. The conversion of measurements—metrication—commenced subsequently in 1971, under the direction of the Metric Conversion Board and actively proceeded until the Board was disbanded in 1981.
Metrication is the act or process of converting to the metric system of measurement. The United Kingdom, through voluntary and mandated laws, has metricated most of government, industry, commerce, and scientific research to the metric system; however, the previous measurement system is still used in society. Imperial units as of 2024 remain mandated by law to still be used without metric units for speed and distance road signs, and the sizes of cider and beer sold by the glass, returnable milk containers and precious metals, and in some areas both measurement systems are mandated by law.
The cup is a cooking measure of volume, commonly associated with cooking and serving sizes. In the US, it is traditionally equal to one-half US pint (236.6 ml). Because actual drinking cups may differ greatly from the size of this unit, standard measuring cups may be used, with a metric cup being 250 millilitres.
Metrication in the Republic of Ireland happened mostly in the 20th century and was officially completed in 2005, with a few exceptions.
Both the British imperial measurement system and United States customary systems of measurement derive from earlier English unit systems used prior to 1824 that were the result of a combination of the local Anglo-Saxon units inherited from Germanic tribes and Roman units.
The Weights and Measures Act is a Canadian law governing the units of measurements used in Canada.
A unit of measurement, or unit of measure, is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity. Any other quantity of that kind can be expressed as a multiple of the unit of measurement.
The imperial and US customary measurement systems are both derived from an earlier English system of measurement which in turn can be traced back to Ancient Roman units of measurement, and Carolingian and Saxon units of measure.
{{cite web}}
: CS1 maint: archived copy as title (link)Halsey Metric Fallacy.
{{cite journal}}
: Cite journal requires |journal=
(help).