Units of measurement

The SI unit used to measure force is the newton (symbol N), which is equivalent to kg·m·s−2. Force - Non-SI units of force and mass. The F=m·a relationship can be used with any consistent units (SI or CGS). If these units are not consistent, a more general form, F=k·m·a, can be used, where the constant k is a conversi ...

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Force, Force - Elementary concepts, Force - Quantitative definition, Force - Types of force, Force - Properties of force, Force - Forces in theory, Force - Units of measurement, Force - Non-SI units of force and mass, Force - Conversions, Force - Forces in everyday life, Force - Forces in the laboratory, Force - Founding experiments, Force - Instruments to measure forces, Force - History

Read more here: » Force: Encyclopedia II - Force - Units of measurement

The definition, agreement and practical use of units of measurement have played a crucial role in human endeavour from early ages up to this day. Disparate systems of measurement used to be very common. Now there is a global standard, the International System (SI) of units, a form of metric system. The SI has been or is in the process of being adopted throughout the world. The United States of America is almost certainly the last to adopt the system but even there it is increasingly being used. Standards are very important. Eac ...

Including:

• Units of measurement - Introduction
• Units of measurement - History
• Units of measurement - Systems of measurement
• Units of measurement - Base and derived units
• Units of measurement - Calculations with units
• Units of measurement - Units as dimensions
• Units of measurement - Guidelines
• Units of measurement - Expressing a physical value in terms of another unit

Read more here: » Units of measurement: Encyclopedia - Units of measurement

Units of measurement - Units as dimensions. Any value of a physical quantity is expressed as a comparison to a unit of that quantity. For example, the value of a physical quantity Q is written as the product of a unit [Q] and a numerical factor: The multiplication sign is usually left out, just as it is left out between variables in scientific notation of formulas. In formulas the unit [Q] can be treated as if it was a kind of physical ...

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Units of measurement, Units of measurement - Introduction, Units of measurement - History, Units of measurement - Systems of measurement, Units of measurement - Base and derived units, Units of measurement - Calculations with units, Units of measurement - Units as dimensions, Units of measurement - Guidelines, Units of measurement - Expressing a physical value in terms of another unit

Read more here: » Units of measurement: Encyclopedia II - Units of measurement - Calculations with units

Cubit is the name for any one of many units of measure used by various ancient peoples. The natural cubit is based on the distance between thumb and another finger to the elbow on an average person. It was employed consistently — to measure originally cords and textiles for example — also in Middle-Ages up to the Early Modern Times. This natural cubit measures 24 digits or 6 palms or 1½ foot. This is about 45 cm or 18 inches. Early on, greater cubits (in a larger sense) featured on: 7 palms, ...

Including:

• Cubit - History of the different cubits
• Cubit - The Sumerian Nippur cubit and the Egyptian royal cubit
• Cubit - Other important cubits

Read more here: » Cubit: Encyclopedia - Cubit

U.S. customary units, commonly known in the United States as English units or standard units, are units of measurement that are currently used in the U.S., in some cases alongside units from SI (the International System of Units—the modern metric system). The U.S. system of units is similar to the Imperial system which was used in the United Kingdom until 1995 (and still has wide unofficial usage). Both systems derive from the evolution of local units over the centuries, as a result of standardization efforts in England; the local units themselves mostly trace back to Roman and Anglo-Saxon units. To ...

Including:

• U.S. customary units - Units of length
• U.S. customary units - Units of area
• U.S. customary units - Units of capacity and volume
• U.S. customary units - Volume in general
• U.S. customary units - Liquid volume
• U.S. customary units - Dry volume
• U.S. customary units - Units of mass
• U.S. customary units - Avoirdupois weight
• U.S. customary units - Apothecaries' weight
• U.S. customary units - Troy weight
• U.S. customary units - Cooking measures
• U.S. customary units - Grain measures
• U.S. customary units - Units of temperature
• U.S. customary units - Other units

Read more here: » U.S. customary units: Encyclopedia - U.S. customary units

A foot (plural: feet) is a non-SI unit of distance or length, measuring around a third of a metre. There are twelve inches in one foot and three feet in one yard. The international standard symbol for feet is ft (see ISO 31-1, Annex A). The standardization of weights and measures has left several different standard foot measures. The most commonly used foot today is the English foot, used in the United Kingdom and the United States and elsewhere, which is defined to be exactly 0.3048 metre. This unit is sometimes ...

Including:

• Foot unit of length - Etymology
• Foot unit of length - External link

Read more here: » Foot unit of length: Encyclopedia - Foot unit of length

Metric systems of units have evolved since the adoption of the first well-defined system in France in 1791. During this evolution the use of these systems spread throughout the world, first to the non-English-speaking countries, and more recently to the English speaking countries. Multiples and submultiples of metric units are related by powers of ten; the names for these are formed with prefixes. Thi ...

Including:

• Systems of measurement - The metric system
• Systems of measurement - Imperial and US customary units
• Systems of measurement - Natural units
• Systems of measurement - Atomic units
• Systems of measurement - Non-standard units
• Systems of measurement - Units of currency
• Systems of measurement - Historical Mediterranean and European systems of measurement
• Systems of measurement - Ancient systems of measurement
• Systems of measurement - Mediæval measurements
• Systems of measurement - The Chinese system
• Systems of measurement - Other historical systems of measurement

Read more here: » Systems of measurement: Encyclopedia - Systems of measurement

The centimetre-gram-second system (CGS) is a system of physical units. It is always the same for mechanical units, but there are several variants of electric additions. The system goes back to a proposal made in 1832 by the German mathematician Carl Friedrich Gauss and was in 1874 extended by the British physicists James Clerk Maxwell and William Thomson with a set of electromagnetic units. The sizes (order of magnitude) of many CGS units turned out to be inconvenient for practical purposes, therefore the CGS system neve ...

Including:

• Centimetre gram second system of units - Electromagnetic units

Read more here: » Centimetre gram second system of units: Encyclopedia - Centimetre gram second system of units

Weights and measures is a term used by legal authorities in English speaking countries such as the United Kingdom for a function related to units of measurement in trade. Metrology is the science for developing national and internationally accepted units of weights and measures. The Bureau international des poids et mesures (BIPM) is tasked with ensuring worldwide uniformity of measurements and th ...

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Shakkan-hō (尺貫法, Shakkan-hō?) is the traditional Japanese system of measurement. The name shakkanhō originates from the name of two of the units, the shak ...

Including:

• Japanese units of measurement - Length
• Japanese units of measurement - Area
• Japanese units of measurement - Volume
• Japanese units of measurement - Mass
• Japanese units of measurement - Money
• Japanese units of measurement - Other Japanese units

Read more here: » Japanese units of measurement: Encyclopedia - Japanese units of measurement

The metric system was created during the French Revolution. On August 1, 1793 the National Convention adopted the new decimal "metre" with a provisional length as well as the other decimal units with preliminary definitions and terms. On April 7, 1795 (Loi du 18 germinal, an III) the terms gramme and kilogramme repaced the former terms "gravet" and "grave". After the 18 Brumaire Year VIII, the metric system was definitively adopted in France by the First Consul Bonaparte, (the later Napoleon I) on Decembre 10, 1799 (Loi ...

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SI, SI - History, SI - Units, SI - SI writing style, SI - Spelling variations, SI - Cultural issues, SI - Trade

Read more here: » SI: Encyclopedia II - SI - History

There have historically been four different English systems of mass: Tower weight, Troy weight, Avoirdupois system, and Apothecaries' system. Tower weight fell out of use (due to legal prohibition) centuries ago, and was never used in the United States. Troy weight is still used to weigh precious metals. Apothecaries weight, once used in pharmacy, has been largely replaced by metric measurements. Avoirdupois weight is th ...

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U.S. customary units, U.S. customary units - Units of length, U.S. customary units - Units of area, U.S. customary units - Units of capacity and volume, U.S. customary units - Volume in general, U.S. customary units - Liquid volume, U.S. customary units - Dry volume, U.S. customary units - Units of mass, U.S. customary units - Avoirdupois weight, U.S. customary units - Apothecaries' weight, U.S. customary units - Troy weight, U.S. customary units - Cooking measures, U.S. customary units - Grain measures, U.S. customary units - Units of temperature, U.S. customary units - Other units

Read more here: » U.S. customary units: Encyclopedia II - U.S. customary units - Units of mass

A nonstandard unit of length is the attoparsec. It comes in disguise and even has a proper abbreviation, "apc". It is, however, rarely used in the real world. Parsecs are used in astronomy to measure enormous interstellar distances; a parsec is approximately 3.26 light-years or 3.085×1016m. Combining it with the "atto" prefix yields attoparsec, a conveniently human-scaled unit of 3.085 centimeters (about 1-7/32 inches) that has no obvious practical use. Interestingly, 1 attoparsec/microfortnight is nearly 1 inch/second (the actual figure is 1.0043 inch per second or approximately 2. ...

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List of strange units of measurement, List of strange units of measurement - Attoparsec, List of strange units of measurement - Barn-megaparsec, List of strange units of measurement - Belgium, List of strange units of measurement - Books and Bible, List of strange units of measurement - Cigarette, List of strange units of measurement - Coffee, List of strange units of measurement - Cut-lunch-and-a-water-bag, List of strange units of measurement - Distance, List of strange units of measurement - Double-decker bus, List of strange units of measurement - FFF, List of strange units of measurement - FFF Base units, List of strange units of measurement - FFF derived units, List of strange units of measurement - Football field, List of strange units of measurement - Gillette, List of strange units of measurement - Happy, List of strange units of measurement - Helen, List of strange units of measurement - Hobo Power, List of strange units of measurement - Jiffy, List of strange units of measurement - KLOC or K-LOC, List of strange units of measurement - Koskenkorva bottle, List of strange units of measurement - Library of Congress, List of strange units of measurement - Metric, List of strange units of measurement - Microbit, List of strange units of measurement - Mikrotuki, List of strange units of measurement - Morgan, List of strange units of measurement - Nanoacre, List of strange units of measurement - Nanocentury, List of strange units of measurement - Nanosecond, List of strange units of measurement - Nelson's Column / Double-decker Bus, List of strange units of measurement - Nibble, List of strange units of measurement - Pikotuki, List of strange units of measurement - Pinkwater, List of strange units of measurement - Poronkusema, List of strange units of measurement - Potrzebie, List of strange units of measurement - Realtor's Throw, List of strange units of measurement - Rhode Island/Texas/Alaska/Washington D.C., List of strange units of measurement - Rods to the Hogshead, List of strange units of measurement - Seemeilen/Woche, List of strange units of measurement - SI-Imperial hybrids, List of strange units of measurement - Siriometer, List of strange units of measurement - Smoot, List of strange units of measurement - Stone's throw/Spitting distance, List of strange units of measurement - Sydharb, List of strange units of measurement - Tall Buildings, List of strange units of measurement - Wales/Belgium, List of strange units of measurement - Warhol

Read more here: » List of strange units of measurement: Encyclopedia II - List of strange units of measurement - Attoparsec

Because measurement involves the estimation of magnitudes of quantities relative to particular quantities, called units, the specification of units is of fundamental importance to measurement. The definition or specification of precise standards of measurement involves two key features, which are evident in the Système International d'Unités (SI). Specifically, in this system the definition of each of the base units makes reference to specific empirical conditions and, with the exception of the kilogram, also to other quantitative a ...

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Measurement, Measurement - Units and systems of measurement, Measurement - Metrology, Measurement - History, Measurement - Difficulties in measurement, Measurement - Miscellaneous

Read more here: » Measurement: Encyclopedia II - Measurement - Units and systems of measurement

The metric system was officially adopted in France after the French Revolution. During the history of the metric system a number of variations have evolved and their use spread around the world replacing many traditional measurement systems. By the end of World War II a number of different systems of measurement were still in use throughout the world. Some of these systems were metric system variations whilst others were based on the Imperial and American systems. It was recognised that additional steps were needed to promote a worldw ...

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SI, SI - History, SI - Units, SI - SI writing style, SI - Spelling variations, SI - Cultural issues

Read more here: » SI: Encyclopedia II - SI - History

A nonstandard unit of length is the attoparsec. It comes in disguise and even has a proper abbreviation, "apc". It is, however, rarely used in the real world. Parsecs are used in astronomy to measure enormous interstellar distances; a parsec is approximately 3.26 light-years or 3.085×1016m. Combining it with the "atto" prefix yields attoparsec, a conveniently human-scaled unit of 3.085 centimeters (about 1-7/32 inches) that has no obvious practical use. Interestingly, 1 attoparsec/microfortnight is nearly 1 inch/second (the actual figure is 1.0043 inch per second or approximately 2. ...

See also:

List of strange units of measurement, List of strange units of measurement - Attoparsec, List of strange units of measurement - Barn-megaparsec, List of strange units of measurement - Belgium, List of strange units of measurement - Books and Bible, List of strange units of measurement - Coffee, List of strange units of measurement - Cut-lunch-and-a-water-bag, List of strange units of measurement - Distance, List of strange units of measurement - FFF, List of strange units of measurement - FFF Base units, List of strange units of measurement - FFF derived units, List of strange units of measurement - Football field, List of strange units of measurement - Gillette, List of strange units of measurement - Helen, List of strange units of measurement - Hobo Power, List of strange units of measurement - Jiffy, List of strange units of measurement - KLOC or K-LOC, List of strange units of measurement - Koskenkorva bottle, List of strange units of measurement - Library of Congress, List of strange units of measurement - Metric, List of strange units of measurement - Microbit, List of strange units of measurement - Mikrotuki, List of strange units of measurement - Morgan, List of strange units of measurement - Nanoacre, List of strange units of measurement - Nanocentury, List of strange units of measurement - Nanosecond, List of strange units of measurement - Nelson's Column / Double-decker Bus, List of strange units of measurement - Nibble, List of strange units of measurement - Pikotuki, List of strange units of measurement - Pinkwater, List of strange units of measurement - Poronkusema, List of strange units of measurement - Potrzebie, List of strange units of measurement - Realtor's Throw, List of strange units of measurement - Rhode Island/Texas/Alaska/Washington D.C., List of strange units of measurement - Rods to the Hogshead, List of strange units of measurement - Seemeilen/Woche, List of strange units of measurement - SI-Imperial hybrids, List of strange units of measurement - Smoot, List of strange units of measurement - Stone's throw/Spitting distance, List of strange units of measurement - Sydharb, List of strange units of measurement - Tall Buildings, List of strange units of measurement - Wales/Belgium, List of strange units of measurement - Warhol

Read more here: » List of strange units of measurement: Encyclopedia II - List of strange units of measurement - Attoparsec

Notes: The value: 296 millimetres for the Roman foot is a usual rounding to the closest millimetre precision. A correct usual value, nearby the length really used by ancient Romans. However, the value of the historical Roman foot scientifically obtained by modern statistical methods is 296.2 mm ± 0.5 mm or about ± 0.17 % (cf. Rottländer, Tübingen, Germany). The widely accepted ratio of the Roman foot and the English foot is 36:35. The latter one is 16/28 Mesopotamian cubit and the ...

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Ancient Roman units of measurement, Ancient Roman units of measurement - Length, Ancient Roman units of measurement - Area, Ancient Roman units of measurement - Volume, Ancient Roman units of measurement - Weight, Ancient Roman units of measurement - Time

Read more here: » Ancient Roman units of measurement: Encyclopedia II - Ancient Roman units of measurement - Length

Cubit - The Sumerian Nippur cubit and the Egyptian royal cubit. The cubit is among the first recorded units of length used by an ancient people. The Egyptian royal cubit: It has been securely estabished from surviving architectural evidence that a standard measure was employed as early as c. 2750 BC (Dynasty III) at Saqqara (J.P.Lauer). From the evidence this is widely accepted to have been 523.5 to 524 mm (20.61 to 20.63 in) in length, and was subdivided int ...

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Cubit, Cubit - History of the different cubits, Cubit - The Sumerian Nippur cubit and the Egyptian royal cubit, Cubit - Other important cubits

Read more here: » Cubit: Encyclopedia II - Cubit - History of the different cubits

While for most units the difference between cgs and SI is a mere power of 10, the differences in electromagnetic units are considerable; so much so that formulas for physical laws need to be changed depending on what system of units one uses. In SI, electric current is defined via the magnetic force it exerts and charge is then defined as current multiplied with time. In one variant of the cgs system, electrostatic units (esu), charge is defined via the force it exerts on other charges, and current is then defined as charge per time. One consequence of this ...

See also:

Centimetre gram second system of units, Centimetre gram second system of units - Electromagnetic units

Read more here: » Centimetre gram second system of units: Encyclopedia II - Centimetre gram second system of units - Electromagnetic units

Metric systems of units have evolved since the adoption of the first well-defined system in France in 1791. During this evolution the use of these systems spread throughout the world, first to the non-English-speaking countries, and more recently to the English speaking countries. Multiples and submultiples of metric units are related by powers of ten; the names for these are formed with prefixes. This relationship is compatible with the decimal system of numbers an ...

See also:

Systems of measurement, Systems of measurement - The metric system, Systems of measurement - Imperial and US customary units, Systems of measurement - Natural units, Systems of measurement - Atomic units, Systems of measurement - Non-standard units, Systems of measurement - Units of currency, Systems of measurement - Historical Mediterranean and European systems of measurement, Systems of measurement - Ancient systems of measurement, Systems of measurement - Mediæval measurements, Systems of measurement - The Chinese system, Systems of measurement - Other historical systems of measurement

Read more here: » Systems of measurement: Encyclopedia II - Systems of measurement - The metric system