"others don't), and in physical sciences academia, ""μg"" remains the sole official abbreviation. In medical data exchange according to the Health Level 7 (HL7) standard, the μ can be replaced by u as well. Micro- Micro- (Greek letter μ or legacy micro symbol µ) is a unit prefix in the metric system denoting a factor of 10 (one millionth). Confirmed in 1960, the prefix comes from the Greek (""""), meaning ""small"". The symbol for the prefix comes from the Greek letter μ (mu). It is the only SI prefix which uses a character not from the Latin alphabet. ""mc"" is"
"has a symbol that is used in combination with the symbols for units of measure. For example, the symbol for ""kilo-"" is 'k', and is used to produce 'km', 'kg', and 'kW', which are the SI symbols for kilometre, kilogram, and kilowatt, respectively. Where the Greek letter 'μ' is unavailable, the symbol for micro 'µ' may be used. Where both variants are unavailable, the micro prefix is commonly written as the lowercase Latin letter 'u'. Prefixes corresponding to an integer power of one thousand are generally preferred. Hence ""100 m"" is preferred over ""1 hm"" (hectometre) or ""10 dam"" (decametres)."
"micri- (10). Double prefixes have been used in the past, such as ""micromillimetres"" or ""millimicrons"" (now nanometres), ""micromicrofarads"" (now picofarads), ""kilomegatons"" (now gigatons), ""hectokilometres"" (now 100 kilometres) and the derived adjective ""hectokilometric"" (typically used for qualifying the fuel consumption measures). These were disallowed with the introduction of the SI. Other obsolete double prefixes included ""decimilli-"" (10), which was contracted to ""dimi-"" and standardized in France up to 1961. In 2010, UC Davis student Austin Sendek started a petition to designate ""hella"" as the SI prefix for one octillion (Short scale; Long scale: Quadrilliard; 10). The petition gathered over 60,000 supporters"
"Myria- Myria- (symbol my) is a now obsolete decimal metric prefix denoting a factor of 10 (ten thousand). It originates from the Greek μύριοι (""mýrioi"") (myriad). The prefix was part of the original metric system adopted by France in 1795, but was not adopted when the SI prefixes were internationally adopted by the 11th CGPM conference in 1960. In 1685 John Wallis proposed the usage of myrio. Also, in 19th century English it was sometimes spelled myrio, in line with a puristic opinion by Thomas Young. The ""myriametre"" (10 km) is occasionally encountered in 19th-century train tariffs, or in some"
"acceptable. Myria- Myria- (symbol my) is a now obsolete decimal metric prefix denoting a factor of 10 (ten thousand). It originates from the Greek μύριοι (""mýrioi"") (myriad). The prefix was part of the original metric system adopted by France in 1795, but was not adopted when the SI prefixes were internationally adopted by the 11th CGPM conference in 1960. In 1685 John Wallis proposed the usage of myrio. Also, in 19th century English it was sometimes spelled myrio, in line with a puristic opinion by Thomas Young. The ""myriametre"" (10 km) is occasionally encountered in 19th-century train tariffs, or in"
"must recognize the micro sign as well. Most fonts use the same glyph for the two characters. Micrometre The micrometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: μm) or micrometer (American spelling), also commonly known by the previous name micron, is an SI derived unit of length equaling (SI standard prefix ""micro-"" = 10); that is, one millionth of a metre (or one thousandth of a millimetre, 0.001 mm, or about 0.000039 inch). The micrometre is a common unit of measurement for wavelengths of infrared radiation as well as sizes of biological cells"
"measurement are spelled out, for example, codice_1 formats as ""3 THz"". Some of the prefixes formerly used in the metric system have fallen into disuse and were not adopted into the SI. The decimal prefix ""myria-"" (sometimes also written as ""myrio-"") (ten thousand) as well as the binary prefixes ""double-"" and ""demi-"", denoting a factor of 2 and (one half), respectively, were parts of the original metric system adopted by France in 1795. These were not retained when the SI prefixes were internationally adopted by the 11th CGPM conference in 1960. Other metric prefixes used historically include hebdo- (10) and"
"SI prefix m for milli) is justified to maintain the rule of only using uppercase letters for resistances (the otherwise resulting M was already in use for mega). Similar, the standard prescribes the following lowercase letters for ""capacitances"" to be used instead of the decimal point: p (for 10), n (for 10), µ (for 10), m (for 10), but uppercase F (for 10 = 1) for farad. The letters p and n weren't part of the first issue of the standard, but were added after the adoption of the corresponding SI prefixes. In cases where the Greek letter µ is"
"Nano- Nano- (symbol n) is a unit prefix meaning ""one billionth"". Used primarily with the metric system, this prefix denotes a factor of 10 or . It is frequently encountered in science and electronics for prefixing units of time and length. Examples: The prefix derives from the Greek (Latin ""nanus""), meaning ""dwarf"". The General Conference on Weights and Measures (CGPM) officially endorsed the usage of ""nano"" as a standard prefix in 1960. When used as a prefix for something other than a unit of measure (as for example in words like ""nanoscience""), nano refers to nanotechnology, or means ""on a"
"Deca- Deca- or deka- (symbol da) is a decimal unit prefix in the metric system, denoting a factor of ten. The term is derived from the Greek """" (), meaning ""ten"". The prefix was a part of the original metric system in 1795. It is not in very common usage, although the decapascal is occasionally used by audiologists. The decanewton is also encountered occasionally, probably because it is an SI approximation of the kilogram-force. Its use is more common in Central Europe. In German, Polish, Czech, Slovak and Hungarian, ""deka"" (or ""deko"") is common and used as a word on"
"scale of nanometres"". See nanoscopic scale. Nano- Nano- (symbol n) is a unit prefix meaning ""one billionth"". Used primarily with the metric system, this prefix denotes a factor of 10 or . It is frequently encountered in science and electronics for prefixing units of time and length. Examples: The prefix derives from the Greek (Latin ""nanus""), meaning ""dwarf"". The General Conference on Weights and Measures (CGPM) officially endorsed the usage of ""nano"" as a standard prefix in 1960. When used as a prefix for something other than a unit of measure (as for example in words like ""nanoscience""), nano refers"
"water at its maximum density was equal to 99.92072% of the mass of the provisional kilogram made earlier that year. On 7 April 1795 the metric system was formally defined in French law. It defined six new decimal units: Decimal multiples of these units were defined by Greek prefixes: """"myria-"""" (10,000), """"kilo-"""" (1000), """"hecto-"""" (100) and """"deka-"""" (10) and submultiples were defined by the Latin prefixes """"deci-"""" (0.1), """"centi-"""" (0.01) and """"milli-"""" (0.001). The 1795 draft definitions enabled provisional copies of the kilograms and metres to be constructed. The task of surveying the meridian arc, which was estimated to take"
"used to multiply the unit by 1000, and the prefix ""milli"" is to indicate a one-thousandth part of the unit. Thus the ""kilogram"" and ""kilometre"" are a thousand grams and metres respectively, and a ""milligram"" and ""millimetre"" are one thousandth of a gram and metre respectively. These relations can be written symbolically as: In the early days, multipliers that were positive powers of ten were given Greek-derived prefixes such as ""kilo-"" and ""mega-"", and those that were negative powers of ten were given Latin-derived prefixes such as ""centi-"" and ""milli-"". However, 1935 extensions to the prefix system did not follow"
"Kilo- Kilo is a decimal unit prefix in the metric system denoting multiplication by one thousand (10). It is used in the International System of Units where it has the unit symbol k, in lower case. The prefix ""kilo"" is derived from the Greek word (), meaning ""thousand"". It was originally adopted by Antoine Lavoisier's research group in 1795, and introduced into the metric system in France with its establishment in 1799. In 19th century English it was sometimes spelled chilio, in line with a puristic opinion by Thomas Young For the kilobyte, a second definition has been in common"
"the 6th letter of the modern and classical Greek alphabet, denotes a value of seven (7) when used as a numeral. Examples: Zetta- Zetta is a decimal unit prefix in the metric system denoting a factor of 10 or . The prefix was added as an SI prefix to the International System of Units (SI) in 1991 and has the symbol Z. Zetta is evocative of the Latin numeral , meaning ""seven"". Therefore it was used to denote the seventh power of 1000. A prefix of the same value, ""hepta"", was informally introduced a few years before the promulgation of"
"Micrometre The micrometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: μm) or micrometer (American spelling), also commonly known by the previous name micron, is an SI derived unit of length equaling (SI standard prefix ""micro-"" = 10); that is, one millionth of a metre (or one thousandth of a millimetre, 0.001 mm, or about 0.000039 inch). The micrometre is a common unit of measurement for wavelengths of infrared radiation as well as sizes of biological cells and bacteria, and for grading wool by the diameter of the fibres. The width of a single"
"this convention: the prefixes ""nano-"" and ""micro-"", for example have Greek roots. During the 19th century the prefix ""myria-"", derived from the Greek word μύριοι (""mýrioi""), was used as a multiplier for . When applying prefixes to derived units of area and volume that are expressed in terms of units of length squared or cubed, the square and cube operators are applied to the unit of length including the prefix, as illustrated below. Prefixes are not usually used to indicate multiples of a second greater than 1; the non-SI units of minute, hour and day are used instead. On the"
"Omicron Omicron (uppercase Ο, lowercase ο, literally ""small o"": όμικρον < ὂ μικρόν - ""ò mikrón"", micron meaning 'small' in contrast to ""omega"") is the 15th letter of the Greek alphabet. In the system of Greek numerals it has a value of 70. This letter is derived from the Phoenician letter ayin . In classical Greek, omicron represented the sound in contrast to ""omega"" and ""ου"" . In modern Greek, omicron represents the . Letters that arose from omicron include Roman O and Cyrillic O. The upper-case letter of omicron (O) was originally used in mathematics as a symbol for"
"Giga- Giga ( or ) is a unit prefix in the metric system denoting a factor of a (short-form) billion (10 or ). It has the symbol G. ""Giga"" is derived from the Greek word , meaning ""giant"". The ""Oxford English Dictionary"" reports the earliest written use of ""giga"" in this sense to be in the Reports of the IUPAC 14th Conference in 1947: ""The following prefixes to abbreviations for the names of units should be used: G giga 10×"". When referring to information units in computing, such as gigabyte, giga may sometimes mean (2), although such use is inconsistent,"
"help compare different orders of magnitude, this section lists lengths between 10 m and 10 m (100 μm and 1 mm). The term ""Myriometre"" (abbr. mom, equivalent to 100 micrometers; frequently confused with the ""Myriametre"", 10 kilometers) is deprecated; the decimal metric prefix myrio- is obsolete and not included among the prefixes when the International System of Units was introduced in 1960. To help compare different orders of magnitude this section lists lengths between 10 m and 10 m (1 mm and 1 cm). To help compare different orders of magnitude this section lists lengths between 10 m and 10"
"So a decimal radix became the ratio between unit sizes of the metric system. In the metric system, multiples and submultiples of units follow a decimal pattern. A common set of decimal-based prefixes that have the effect of multiplication or division by an integer power of ten can be applied to units that are themselves too large or too small for practical use. The concept of using consistent classical (Latin or Greek) names for the prefixes was first proposed in a report by the French Revolutionary Commission on Weights and Measures in May 1793. The prefix ""kilo"", for example, is"
"Greek units of measurement A number of units of measurement were used in Greece to measure length, mass, area, and capacity. In Greece, the metric system has been used since 1836 and was made compulsory in 1922. One ""piki"" varied from 0.640 m to 0.670 m. 1 ""pic"" was equal to 1 piki. The ""small piki"" of Constantinople (also known as the ""endeze"") was equal to 0.648 m The ""large piki"" of Constantinople (also known as the ""arsin"") was equal to 0.669 m A masonry ""piki"" (also known as the ""meimar zire"") was equal to 0.750 m. Two types of"
"Mega- Mega is a unit prefix in metric systems of units denoting a factor of one million (10 or ). It has the unit symbol M. It was confirmed for use in the International System of Units (SI) in 1960. ""Mega"" comes from . When units occur in exponentiation, such as in square and cubic forms, any multiples-prefix is considered part of the unit, and thus included in the exponentiation. In some fields of computing, ""mega"" may sometimes denote 1,048,576 (2) of information units, for example, a megabyte, a megaword, but denotes (10) units of other quantities, for example, transfer"
"in France in 1795, but they were not retained when the SI prefixes were agreed internationally by the 11th CGPM conference in 1960. The prefix """"myrio-"""" was an alternative spelling variant for """"myria-"""", as proposed by Thomas Young. A binary prefix indicates multiplication by a power of two. The tenth power of 2 (2) has the value , which is close to . This has prompted the use of the metric prefixes ""kilo"", ""mega"", and ""giga"" to also denote the powers of 1024 which is common in information technology with the unit of digital information, the byte. Units of information"
"preferred, but implementations must recognize the micro sign as well. In circumstances in which only the Latin alphabet is available, ISO 2955 (1974, 1983), DIN 66030 (Vornorm 1973; 1980, 2002) and BS 6430 (1983) allow the prefix codice_3 to be substituted by the letter codice_4 (or even codice_5, if lowercase letters are not available), as, for example, in codice_6 for codice_7, or codice_8 for codice_9. Similar, capacitor values according to the RKM code defined in IEC 60062 (IEC 62) (since 1952), EN 60062, DIN 40825 (1973), BS 1852 (1974), IS 8186 (1976) etc. can be written as codice_10 (or codice_11)"
"German, Dutch, and the Scandinavian languages likewise spell the word ""meter."" Measuring devices (such as ammeter, speedometer) are spelled ""-meter"" in all variants of English. The suffix ""-meter"" has the same Greek origin as the unit of length. The etymological roots of ""metre"" can be traced to the Greek verb ' (metreo) (to measure, count or compare) and noun ' (metron) (a measure), which were used for physical measurement, for poetic metre and by extension for moderation or avoiding extremism (as in ""be measured in your response""). This range of uses is also found in Latin (""metior"", ""mensura""), French (""mètre"","
"Zetta- Zetta is a decimal unit prefix in the metric system denoting a factor of 10 or . The prefix was added as an SI prefix to the International System of Units (SI) in 1991 and has the symbol Z. Zetta is evocative of the Latin numeral , meaning ""seven"". Therefore it was used to denote the seventh power of 1000. A prefix of the same value, ""hepta"", was informally introduced a few years before the promulgation of zetta. It was formed from the Greek (), also meaning ""seven"". ""Hepta"" never received official sanction and is obsolete. Zeta (), although"
"the introduction of metric prefixes to derive bigger and smaller sizes from base unit names. Examples include ""kilo"" for 1000, ""hecto"" for 100, ""centi"" for 1/100 and ""milli"" for 1/1000. The list of metric prefixes has expanded in modern times to encompass a wider range of measurements. While the common units of time, minute, hour, day, month and year, are not decimalised, there have been proposals for decimalisation of the time of day and decimal calendar systems. Astronomers use a decimalised Julian day number to record and predict events. Decimal currencies have sub-units based on a factor of 10. There"
"1–9; the next nine, beginning with iota (Ι), stand for the multiples of ten (10, 20, etc. up to 90); and the last nine, beginning with rho (Ρ), stand for the hundreds (100 – 900). For this purpose, the 24 letters of the standard classical Greek alphabet were used with the addition of three archaic or local letters: digamma/""wau"" (Ϝ, , originally denoting the sound ) for ""6"", koppa (Ϙ, originally denoting the sound ) for ""90"", and sampi for ""900"". While digamma and koppa were retained in their original alphabetic positions inherited from Phoenician, the third archaic Phoenician character,"
"the source of the mathematical symbol ∪, representing a union. It is used mainly for Venn diagrams and geometry. It is used as for ""micro-"" in metric measurements as a replacement for the Greek letter μ (mu), of which it is a graphic approximation, when that Greek letter is not available, as in ""um"" for μm (micrometer). Some universities, such as the University of Miami and the University of Utah, are locally known as ""The U"". U (or sometimes RU) is a standard height unit of measure in rack units, with each U equal to . U U (named ""u"""
"true. The decimal SI prefixes ""kilo"", ""mega"", ""giga"", ""tera"", etc., are powers of 10 = 1000. The binary prefixes ""kibi"", ""mebi"", ""gibi"", ""tebi"", etc. respectively refer to the corresponding power of 2 = 1024. In casual usage, when 1024 is a close enough approximation of 1000, the two corresponding prefixes are equivalent. Note: this page mixes between two kinds of entropies: These two definitions are not entirely equivalent, see Entropy in thermodynamics and information theory. For comparison, the Avogadro constant is entities per mole, based upon the number of atoms in 12 grams of carbon-12 isotope. In 2012, some hard"
"the Comité International des Poids et Mesures (CIPM) assigned it the symbol ""M"", wishing to use only single-letter symbols. This meant that myriameter, for example, was abbreviated Mm. But in the first part of the twentieth century, electrical engineers began to use capital M for the prefix mega-, as in megawatt and megohm. This usage became so widely and firmly adopted that in 1935 the CIPM adopted the prefix “mega-” with “M” as its symbol, dropping the myria- entirely. In 1975, the United States, having previously authorized use of the myriameter and myriagram in 1866, declared the terms no longer"
"the object to be measured is lightly touched by both the spindle and the anvil. Micrometers are also used in telescopes or microscopes to measure the apparent diameter of celestial bodies or microscopic objects. The micrometer used with a telescope was invented about 1638 by William Gascoigne, an English astronomer. Colloquially the word ""micrometer"" is often shortened to mike or mic ( ). The word ""micrometer"" is a neoclassical coinage . The ""Merriam-Webster Collegiate Dictionary"" says that English got it from French and that its first known appearance in English writing was in 1670. Neither the metre nor the micrometre"