International System of Units & Measurement - Unionpedia, the concept map

Amount of substance

In chemistry, the amount of substance (symbol n) in a given sample of matter is defined as a ratio between the number of elementary entities (N) and the Avogadro constant (NA).

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Ampere

The ampere (symbol: A), often shortened to amp,SI supports only the use of symbols and deprecates the use of abbreviations for units.

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Avogadro constant

The Avogadro constant, commonly denoted or, is an SI defining constant with an exact value of (reciprocal moles).

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Boltzmann constant

The Boltzmann constant is the proportionality factor that relates the average relative thermal energy of particles in a gas with the thermodynamic temperature of the gas.

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Candela

The candela (or; symbol: cd) is the unit of luminous intensity in the International System of Units (SI).

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Centimetre–gram–second system of units

The centimetre–gram–second system of units (CGS or cgs) is a variant of the metric system based on the centimetre as the unit of length, the gram as the unit of mass, and the second as the unit of time.

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Electric current

An electric current is a flow of charged particles, such as electrons or ions, moving through an electrical conductor or space.

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Elementary charge

The elementary charge, usually denoted by, is a fundamental physical constant, defined as the electric charge carried by a single proton or, equivalently, the magnitude of the negative electric charge carried by a single electron, which has charge −1.

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French language

French (français,, or langue française,, or by some speakers) is a Romance language of the Indo-European family.

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General Conference on Weights and Measures

The General Conference on Weights and Measures (abbreviated CGPM from the Conférence générale des poids et mesures) is the supreme authority of the International Bureau of Weights and Measures (BIPM), the intergovernmental organization established in 1875 under the terms of the Metre Convention through which member states act together on matters related to measurement science and measurement standards.

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Gram

The gram (originally gramme; SI unit symbol g) is a unit of mass in the International System of Units (SI) equal to one thousandth of a kilogram.

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International Bureau of Weights and Measures

The International Bureau of Weights and Measures (Bureau international des poids et mesures, BIPM) is an intergovernmental organisation, through which its 59 member-states act on measurement standards in areas including chemistry, ionising radiation, physical metrology, as well as the International System of Units (SI) and Coordinated Universal Time (UTC).

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Isotopes of caesium

Caesium (55Cs) has 41 known isotopes, the atomic masses of these isotopes range from 112 to 152.

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Kelvin

The kelvin, symbol K, is the base unit of measurement for temperature in the International System of Units (SI).

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Kilogram

The kilogram (also kilogramme) is the base unit of mass in the International System of Units (SI), having the unit symbol kg.

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Kilometre

The kilometre (SI symbol: km; or), spelt kilometer in American English and Philippine English, is a unit of length in the International System of Units (SI), equal to one thousand metres (kilo- being the SI prefix for). It is the preferred measurement unit to express distances between geographical places on land in most of the world; notable exceptions are the United States and the United Kingdom where the statute mile is used.

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Length

Length is a measure of distance.

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Luminous efficacy

Luminous efficacy is a measure of how well a light source produces visible light.

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Luminous intensity

In photometry, luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle, based on the luminosity function, a standardized model of the sensitivity of the human eye.

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Mass

Mass is an intrinsic property of a body.

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Metre

The metre (or meter in US spelling; symbol: m) is the base unit of length in the International System of Units (SI).

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Metre Convention

The Metre Convention (Convention du Mètre), also known as the Treaty of the Metre, is an international treaty that was signed in Paris on 20 May 1875 by representatives of 17 nations: Argentina, Austria-Hungary, Belgium, Brazil, Denmark, France, Germany, Italy, Peru, Portugal, Russia, Spain, Sweden and Norway, Switzerland, Ottoman Empire, United States of America, and Venezuela.

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Metric system

The metric system is a decimal-based system of measurement.

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Metrology

Metrology is the scientific study of measurement.

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MKS units

The metre, kilogram, second system of units, also known more briefly as MKS units or the MKS system, is a physical system of measurement based on the metre, kilogram, and second (MKS) as base units.

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Mole (unit)

The mole (symbol mol) is a unit of measurement, the base unit in the International System of Units (SI) for amount of substance, a quantity proportional to the number of elementary entities of a substance.

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National Institute of Standards and Technology

The National Institute of Standards and Technology (NIST) is an agency of the United States Department of Commerce whose mission is to promote American innovation and industrial competitiveness.

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Physical quantity

A physical quantity (or simply quantity) is a property of a material or system that can be quantified by measurement.

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Planck constant

The Planck constant, or Planck's constant, denoted by is a fundamental physical constant of foundational importance in quantum mechanics: a photon's energy is equal to its frequency multiplied by the Planck constant, and the wavelength of a matter wave equals the Planck constant divided by the associated particle momentum.

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Second

The second (symbol: s) is the unit of time in the International System of Units (SI), historically defined as of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each (24 × 60 × 60.

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SI base unit

The SI base units are the standard units of measurement defined by the International System of Units (SI) for the seven base quantities of what is now known as the International System of Quantities: they are notably a basic set from which all other SI units can be derived.

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Speed of light

The speed of light in vacuum, commonly denoted, is a universal physical constant that is exactly equal to). According to the special theory of relativity, is the upper limit for the speed at which conventional matter or energy (and thus any signal carrying information) can travel through space.

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System of units of measurement

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.

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Temperature

Temperature is a physical quantity that quantitatively expresses the attribute of hotness or coldness.

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Time

Time is the continued sequence of existence and events that occurs in an apparently irreversible succession from the past, through the present, and into the future.

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Uncertainty

Uncertainty or incertitude refers to epistemic situations involving imperfect or unknown information.

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Unit of measurement

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.

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Watt

The watt (symbol: W) is the unit of power or radiant flux in the International System of Units (SI), equal to 1 joule per second or 1 kg⋅m2⋅s−3.

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