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

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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

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The watt (symbol: W) is the SI derived unit of power. Watt - Definition. One watt is one joule of energy per second. 1 W = 1 J/s = 1 newton meter per second SI, Kilowatt hour (kW·h), Watt balance, Conversion of units, Orders of magnitude (power), James Watt, RMS, Back to the Future Watt - Origin. The watt is named after James Watt for his contributions to the development of the steam engine, and was adopted by t ...

Including:

• Watt - Definition
• Watt - Origin
• Watt - SI multiples
• Watt - Conversions
• Watt - Derived and qualified units for power distribution
• Watt - Kilowatt-hour MWd
• Watt - MWe MWt

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This article lists conversion factors between a number of units of measurement. Conversion of units - Conversion techniques. The simplest way to convert from one unit to another is to carry through the units themselves in the mathematical operation. To illustrate this process, consider the following examples. You would like to convert 6 feet into metres. Consulting the table below and finding that one foot is exactly 0.3048 metre, you can now perform the mathematical conversion: Notice that th ...

Including:

• Conversion of units - Conversion techniques
• Conversion of units - Rounding of results
• Conversion of units - Tables of conversion factors
• Conversion of units - Length
• Conversion of units - Area
• Conversion of units - Volume
• Conversion of units - Angle
• Conversion of units - Mass
• Conversion of units - Time
• Conversion of units - Speed
• Conversion of units - Acceleration
• Conversion of units - Force
• Conversion of units - Pressure
• Conversion of units - Energy or work
• Conversion of units - Power
• Conversion of units - Angular momentum
• Conversion of units - Electric current
• Conversion of units - Electric charge
• Conversion of units - Electromotive force
• Conversion of units - Electrical resistance
• Conversion of units - Dynamic viscosity
• Conversion of units - Kinematic viscosity
• Conversion of units - Temperature

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The coulomb (symbol: C) is the SI unit of electric charge. It is named after Charles-Augustin de Coulomb (1736 to 1806). Coulomb - Definition. 1 coulomb is the amount of electric charge carried by a current of 1 ampere flowing for 1 second. Coulomb's law, Current (electricity), Faraday constant, Quantity of electricity, SI, Ampere Coulomb - Explanation. The coulomb is also the unit of electric flux. (See Gauss Law).

• Coulomb - Definition
• Coulomb - Explanation
• Coulomb - SI multiples
• Coulomb - Conversions

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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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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

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The metre (Commonwealth English) or meter (American English) (symbol: m) is the SI base unit of length. It is defined as the length of the path travelled by light in absolute vacuum during a time interval of 1/299,792,458 of a second. Adding SI prefixes to metre creates multiples and submultiples; for example kilometre (1000 metres; kilo- = 1000) and millimetre (one thousandth of a metre; milli- = 1 / 1 000). Metre - SI prefixes applied to the metre. The metr ...

Including:

• Metre - SI prefixes applied to the metre
• Metre - Conversions
• Metre - History
• Metre - Timeline of definition

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In physics, a force is an external cause responsible for any change of a physical system. For instance, a person holding a dog by a rope is experiencing the force applied by the rope on their hand, and the cause for its pulling forward is the force exercised by the rope. The kinetic expression of this change is, according to Newton's second law, acceleration, but non-kinetic expressions such as deformation can also occur. The SI unit for force is the newton. Force - Elementary concepts. Force in its most pr ...

Including:

• 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

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The ampere (symbol: A) is the SI base unit of electrical current equal to one coulomb per second. It is named after André-Marie Ampère, one of the main discoverers of electromagnetism. Ampere - Definition. The ampere is that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed 1 metre apart in vacuum, would produce between these conductors a force equal to 2×10–7 newton per metre of length. ...

Including:

• Ampere - Definition
• Ampere - Explanation
• Ampere - External link

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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

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CODATA (Committee on Data for Science and Technology) was established in 1966 as an interdisciplinary committee of the International Council of Science (ICSU), formerly the International Council of Scientific Unions. It seeks to improve the compilation, critical evaluation, storage, and retrieval of data of importance to science and technology. The CODATA Task Group on Fundamental Constants was established in 1969. Its purpose is to periodically provide the international scientific and technological communities with an i ...

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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

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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

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In France, again, there were many local variants. For instance, the lieue could vary from 3.268 km in Beauce to 5.849 km in Provence. Between 1812 and 1839, many of the traditional units continued in metrified adaptations as the mesures usuelles. In Paris, the redefinition in terms of metric units made 1 decimal meter exactly 443.296 French lines = 3 French feet, 0 French inch and 11.296 French lines. In Quebec, the surveys in French units were converted using the relationship 1 pied (of the French v ...

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French units of measurement, French units of measurement - French system, French units of measurement - Length, French units of measurement - Area, French units of measurement - Volume, French units of measurement - Weight, French units of measurement - Power

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There were several variants. The Castilian is shown. Spanish units of measurement - Length. punto – point, 1 / 12 línea línea – line, 1 / 12 pulgada pulgada – inch, 1 / 36 vara, 0.02322 m pie – foot, 12 pulgadas, 0.2786 m vara – yard, 0.8359 m paso – pace, 60 pulgadas < ...

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Spanish units of measurement, Spanish units of measurement - Spanish system, Spanish units of measurement - Length

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A change in temperature of 1°C is equal to a change in temperature of 1K. Temperature in °C = Temperature in kelvins - 273.15 Thus, one could think of the Kelvin scale as the same as the Celsius scale, with its zero point moved down to absolute zero. This perspective is historically accurate; however, it has become more convenient to fix the standard for the kelvin, and thus the Celsius scale is derived from that standard (i.e., it now depends on absolute zero and the triple point of water with a 0.01 K offset — the boiling point of wa ...

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SI derived unit, SI derived unit - Dimensionless derived units, SI derived unit - Derived units with special names, SI derived unit - Other quantities and units, SI derived unit - Conversion between kelvins and degrees Celsius

Read more here: » SI derived unit: Encyclopedia II - SI derived unit - Conversion between kelvins and degrees Celsius

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 ...

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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 systems of measurement, Systems of measurement - Ancient Mediterranean systems of measurement, Systems of measurement - Ancient South Asian systems of measurement, Systems of measurement - Ancient East Asian systems of measurement, Systems of measurement - Islamic measurements, Systems of measurement - Mediæval European measurements, Systems of measurement - Other historical systems of measurement

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

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

Norwegian units of measurement - Nautical. favn – fathom (pl. favner), 3 alen, 1.88 m kabellengde – cable length, 100 favner188 m, or 1/10 international nautical mile, 185.2 m kvartmil – quarter mile, 10 kabellengder, 1852 m sjømil – sea mile, now often the international nautical mile, 1.852 km, but also used for other nautical miles and the geografisk mil geografisk mil – 7421 m or 4.007 nau ...

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Norwegian units of measurement, Norwegian units of measurement - Length, Norwegian units of measurement - Nautical, Norwegian units of measurement - Area, Norwegian units of measurement - Volume, Norwegian units of measurement - Weight, Norwegian units of measurement - Monetary, Norwegian units of measurement - Miscellaneous, Norwegian units of measurement - External link

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