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One of the seven units of measurement that define the metric system
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
SI_base_unit
Measurement unit derived from basic metric value
SI derived units are units of measurement derived from the seven SI base units specified by the International System of Units (SI). They can be expressed
SI_derived_unit
Definition of the units kg, A, K and mol
In 2019, four of the seven SI base units specified in the International System of Quantities were redefined in terms of natural physical constants, rather
2019_revision_of_the_SI
Modern form of the metric system
coordinates the SI. The SI comprises a coherent system of units of measurement starting with seven base units, which are the second (symbol: s, the unit of time)
International_System_of_Units
Since its introduction in 1960, the base units for the International system of units, known as SI, have changed several times. Tables in this article
Historical definitions of the SI base units
Historical_definitions_of_the_SI_base_units
SI unit of amount of substance
The mole (symbol mol) is a unit of measurement, the base unit in the International System of Units (SI) for amount of substance. One mole is an aggregate
Mole_(unit)
SI unit of length
(or meter in US spelling; symbol: m) is the base unit of length in the International System of Units (SI). Since 2019, the metre has been defined as the
Metre
Unit of length 1/1000 of a metre
International System of Units (SI), equal to one thousandth of a metre, the SI base unit of length. 1 metre = 1000 millimetres 1 centimetre = 10 millimetres One
Millimetre
SI unit of magnetic field strength
{\displaystyle \mathrm {T={\dfrac {N{\cdot }s}{C{\cdot }m}}} .} Expressed in SI base units, 1 tesla is: T = k g A ⋅ s 2 , {\displaystyle \mathrm {T={\dfrac {kg}{A{\cdot
Tesla_(unit)
Unit of measurement adopted by convention for a base quantity
A base unit of measurement (also referred to as a base unit or fundamental unit) is a unit of measurement adopted for a base quantity. A base quantity
Base_unit_of_measurement
System of quantities used in science and their interrelationships
dimensions of the base quantities are denoted by L, M, T, I, Θ, N and J, respectively."). The associated quantity symbol, the SI unit name and SI unit symbol are
International System of Quantities
International_System_of_Quantities
Class of units of measurement
examples are the units of the International System of Units (SI). By extension they include units of electromagnetism from the CGS and SI units systems, and
List_of_metric_units
Unit of force in physics
The newton (symbol: N) is the unit of force in the International System of Units (SI). Expressed in terms of SI base units, it is 1 kg⋅m/s2, the force that
Newton_(unit)
Decimal-based systems of measurement
modern definition in the International System of Units (SI) prescribes the metric prefixes and seven base units: metre (m), kilogram (kg), second (s), ampere
Metric_system
Variant of the metric system
the SI base units of length, mass, and time: 1 unit of pressure = 1 unit of force / (1 unit of length)2 = 1 unit of mass / (1 unit of length × (1 unit of
Centimetre–gram–second system of units
Centimetre–gram–second_system_of_units
SI unit of temperature
The kelvin (symbol: K) is the base unit for temperature in the International System of Units (SI). The Kelvin scale is an absolute temperature scale that
Kelvin
Order of magnitude indicator
Y, y, Z, z); already used for SI units (including: SI base units, SI derived units, non-SI units mentioned in the SI; A, B, C, d, F, g, H, h, J, K, L
Metric_prefix
SI unit of luminous intensity
Candela (symbol: cd) is the SI unit of luminous intensity. It measures the luminous power per unit solid angle emitted in a particular direction. A common
Candela
SI base unit of electric current
symbol: A), often shortened to amp, is the unit of electric current in the International System of Units (SI). One ampere is equal to 1 coulomb (C) moving
Ampere
Metric unit of mass
spelled kilogramme) is the base unit of mass in the International System of Units (SI), equal to one thousand grams. It has the unit symbol kg. The word "kilogram"
Kilogram
Measurement unit for time
A unit of time is any particular time interval, used as a standard way of measuring or expressing duration. The base unit of time in the International
Unit_of_time
SI unit of energy
/dʒaʊl/ JOWL; symbol: J) is the unit of energy in the International System of Units (SI). In terms of SI base units, one joule corresponds to one kilogram-metre
Joule
SI derived unit of pressure
The pascal (symbol: Pa) is the unit of pressure in the International System of Units (SI). It is also used to quantify internal pressure, stress, Young's
Pascal_(unit)
Unit of action or angular momentum
unit of action and of angular momentum in the International System of Units (SI) equal to the product of an SI derived unit, the joule (J), and an SI
Joule-second
Unit of time based on Earth's orbit
In astronomy, the Julian year is a unit of time defined as 365.25 days, each of exactly 86400 seconds (SI base unit), totaling exactly 31,557,600 seconds
Year
SI unit of electric capacitance
is named after the English physicist Michael Faraday (1791–1867). In SI base units 1 F = 1 kg−1⋅m−2⋅s4⋅A2. The capacitance of a capacitor is one farad
Farad
SI unit of frequency
event (or cycle) per second. The hertz is an SI derived unit whose formal expression in terms of SI base units is 1/s or s−1, meaning that one hertz is one
Hertz
Metric unit of mass
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. Originally
Gram
SI derived unit of angle
denoted by the symbol rad, is the unit of angle in the International System of Units (SI) and is the standard unit of angular measure used in many areas
Radian
Type of system of units of measurement
derived unit m/s uses only the base units of the SI system. The derived unit km/h requires numerical factors to relate to the SI base units: e.g. 18 km/h
Coherence (units of measurement)
Coherence_(units_of_measurement)
Indicates multiples or fractions of a unit
problematic since a symbol "o" could be confused with zero. Order of magnitude SI base unit Indian numbering system "The names zepto and zetta suggest the digit
Unit_prefix
SI unit of electric conductance
(symbol: S) is the unit of electric conductance, electric susceptance, and electric admittance in the International System of Units (SI). Conductance, susceptance
Siemens_(unit)
Visible light per unit solid angle
direction per unit solid angle, based on the luminosity function, a standardized model of the sensitivity of the human eye. The SI unit of luminous intensity
Luminous_intensity
SI unit of time
exactly; definitions of the SI base units kilogram, ampere, kelvin, and candela also depend on the second. The only base unit whose definition does not
Second
different units (some only of historical interest) are shown and expressed in terms of the corresponding SI unit. Conversions between units in the metric
List_of_conversion_factors
Centimeter–gram–second unit of acceleration
which is the base unit of time in both the CGS and the modern SI system. In SI base units, 1 Gal is equal to 0.01 m/s2. The acceleration due to Earth's
Gal_(unit)
Standard unit of mass for atomic-scale entities
CODATA recommended value of the atomic mass constant expressed in the SI base unit kilogram is: mu = 1.66053906892(52)×10−27 kg. The previous 2018 CODATA
Dalton_(unit)
Unit of length
10−12 m, or one trillionth (1/1000000000000) of a metre, which is the SI base unit of length. The picometre is one thousand femtometres, one thousandth
Picometre
SI derived unit of magnetic flux
ər/ VAY-, WEH-bər; symbol: Wb) is the unit of magnetic flux in the International System of Units (SI). The unit is derived (through Faraday's law of induction)
Weber_(unit)
launched the International System of Units (in French the Système international d'unités or SI) with six "base units": the metre, kilogram, second, ampere
History_of_the_metric_system
SI derived unit of speed and velocity
covering a distance of one metre in a time of one second. As the base unit for speed in the SI, it is commonly used in physics, mechanics, and engineering
Metre_per_second
SI unit of inductance
The henry (symbol: H) is the unit of electrical inductance in the International System of Units (SI), defined as 1 kg⋅m2⋅s−2⋅A−2. If a current of 1 ampere
Henry_(unit)
SI derived unit of electric charge
The coulomb (symbol: C) is the unit of electric charge in the International System of Units (SI). It is defined to be equal to the electric charge delivered
Coulomb
Unit of volume
(Commonwealth spelling) or liter (American spelling) (SI symbols L and l, other symbol used: ℓ) is a metric unit of volume. It is equal to 1 cubic decimetre (dm3)
Litre
Variant of the centimetre–gram–second unit system
the quantity charge. In the ISQ, a separate base dimension, electric current, with the associated SI unit, the ampere, is associated with electromagnetic
Gaussian_units
Unit of measurement for temperature
Celsius temperature scale has been defined in terms of the kelvin, the SI base unit of thermodynamic temperature (symbol: K). Absolute zero, the lowest temperature
Celsius
Measurement of radiation exposure
which the SI unit sievert or the non-SI rem are used. The following table shows radiation quantities in SI and non-SI units: Gray (unit) – SI unit of absorbed
Roentgen_(unit)
Unit of magnetic induction
System of Units specified that 1 gauss equalled 10-4 tesla. After the 2019 revision of the SI included a change to the definition of the base unit ampere
Gauss_(unit)
SI derived unit of visible light emission
The lumen (symbol: lm) is the SI unit of luminous flux, which quantifies the perceived power of visible light emitted by a source. Luminous flux differs
Lumen_(unit)
Unit of length
centimetre is the base unit of length in the now deprecated centimetre–gram–second (CGS) system of units. Though for many physical quantities, SI prefixes for
Centimetre
Overview of and topical guide to the metric system
Convention since 1960. Child articles are: SI base unit SI derived unit Non-SI units mentioned in the SI Metric prefixes Discussions of the underlying
Outline_of_the_metric_system
Metric unit of area
The hectare (/ˈhɛktɛər, -tɑːr/; SI symbol: ha) is a non-SI metric unit of area equal to a square with 100-metre sides (1 hm2), that is, 10,000 square metres
Hectare
SI derived unit of absorbed dose of ionizing radiation
The gray (symbol: Gy) is the unit of ionizing radiation dose in the International System of Units (SI), defined as the absorption of one joule of radiation
Gray_(unit)
SI derived unit of voltage
watt of power between those points. It can be expressed in terms of SI base units (m, kg, s, and A) as V = power electric current = W A = kg ⋅ m 2 ⋅ s
Volt
Metric unit of mass equivalent to 1,000 kilograms or 1 megagram
Megagram is the corresponding official SI unit with the same mass; it is rarely used, in part because the base SI unit of mass is the kilogram, not the gram
Tonne
Unit of length equal to 1,000 metres
SI units are pronounced with the stress on the first syllable (as in kilogram, kilojoule and kilohertz) and the pronunciation of the actual base unit
Kilometre
SI unit of torque
newton-meter; symbol N⋅m or N m) is the unit of torque (also called moment of force) in the International System of Units (SI). One newton-metre is equal to the
Newton-metre
Reference value of length
these fingers gave a Roman foot of 29.633 cm. The base unit in the International System of Units (SI) is the metre, defined as "the length of the path
Unit_of_length
Process of assigning numbers to objects or events
International System of Units (SI). This system reduces all physical measurements to a mathematical combination of seven base units. Metrology is the science
Measurement
Units used to measure energy
Energy is defined via work, so the SI unit of energy is the same as the unit of work – the joule (J), named in honour of James Prescott Joule and his
Units_of_energy
Measurement system based on metre, kilogram, and second
System of Units (SI, from the French name Système international d'unités) was originally created as a formalization of the MKS system. The SI has been
MKS_units
SI derived unit of acceleration
second is the unit of acceleration in the International System of Units (SI). As a derived unit, it is composed from the SI base units of length, the
Metre_per_second_squared
Unit of catalytic activity
enzyme unit was adopted by the International Union of Biochemistry in 1964. However, since the minute is not an SI base unit of time, the enzyme unit is discouraged
Enzyme_unit
Physical constant relating particle kinetic energy with temperature
seven SI base units. The Boltzmann constant is defined to be exactly 1.380649×10−23 joules per kelvin, with the effect of defining the SI unit kelvin
Boltzmann_constant
Non-SI unit measuring absorbed dose of ionizing radiation
Gy) in SI derived units. The rad is still used in the United States, although this is "strongly discouraged" in Chapter 5.2 of the Guide to the SI, which
Rad_(radiation_unit)
Flow of electric charge
equivalent to one coulomb per second. The ampere is an SI base unit and electric current is a base quantity in the International System of Quantities (ISQ)
Electric_current
Topics referred to by the same term
Base unit may refer to: Base unit (measurement), in physics, a unit of measurement from which derived units may be compounded SI base unit, a base unit
Base_unit
Unit of time equal to 1,000,000 years
coherent SI unit. Instead of y or yr (for year), the derived unit a (lat. annus, year) can be used, which is a multiple of the SI base unit second. This
Million_years_ago
Science of measurement and its application
reproducible SI units has led the BIPM to complete the task of defining all SI base units in terms of physical constants. By defining SI base units with respect
Metrology
Unit of length; one millionth of a metre
in US spelling; symbol: μm) is a unit of length in the International System of Units (SI) equalling 10−6 metre (SI standard prefix "micro-" = 10−6);
Micrometre
SI derived unit of electrical resistance
the uppercase Greek letter omega) is the unit of electrical resistance in the International System of Units (SI). It is named after German physicist Georg
Ohm
Unit for cross sectional area used in high-energy physics
A barn (symbol: b) is a non-SI metric unit of area equal to 10−28 m2 (100 fm2). This corresponds to the area of a square with side 10−14 m (10 fm) or a
Barn_(unit)
SI derived unit of radioactivity
becquerel (/ˌbɛkəˈrɛl/ ; symbol: Bq) is the unit of radioactivity in the International System of Units (SI). One becquerel is defined as an activity of
Becquerel
SI derived unit of luminance
square meter) is the unit of luminance in the International System of Units (SI). The unit is based on the candela, the SI unit of luminous intensity
Candela_per_square_metre
Topics referred to by the same term
(symbol: K) is the SI base unit of temperature. Kelvin may also refer to: William Thomson, 1st Baron Kelvin, physicist, namesake of kelvin, unit of temperature
Kelvin_(disambiguation)
science and in commerce. Two of the base SI units and 17 of the derived units are named after scientists. 28 non-SI units are named after scientists. By this
List of scientists whose names are used as units
List_of_scientists_whose_names_are_used_as_units
Physical constant in quantum mechanics
together with other constants, to define the kilogram, the SI unit of mass. The SI units are defined such that the Planck constant has the exact value
Planck_constant
Concept in the physics of electromagnetism
The unit for magnetic moment in International System of Units (SI) base units is A⋅m2, where A is ampere (SI base unit of current) and m is meter (SI base
Magnetic_moment
System of codes for unambiguously representing measurement units
base units form a set of mutually independent dimensions as required by dimensional analysis. Some of the UCUM base units are different from the SI base
Unified Code for Units of Measure
Unified_Code_for_Units_of_Measure
Unit of volume
(or cubic centimeter in US English) (SI unit symbol: cm3; non-SI abbreviations: cc and ccm) is a commonly used unit of volume that corresponds to the volume
Cubic_centimetre
Quantity of a three-dimensional space
quantified numerically using SI derived units (such as the cubic metre and litre) or by various imperial or US customary units (such as the gallon, quart
Volume
Non-SI unit of radioactivity
The curie (symbol Ci) is a non-SI unit of radioactivity originally defined in 1910. According to a notice in Nature at the time, it was to be named in
Curie_(unit)
Distance from center of Earth to center of Moon
{\textstyle \Delta _{\oplus L}} ), or Earth–Moon characteristic distance, is a unit of measure in astronomy. More technically, it is the semi-major axis of the
Lunar_distance
Decimal unit prefix in the metric system
conventional, internationally adopted, definitions of the SI prefixes." A new set of binary prefixes, based on powers of 2, was introduced by the International
Kilo-
Relative deformation of a physical body
its dual is considered. Strain has dimension of a length ratio, with SI base units of meter per meter (m/m). Hence strains are dimensionless and are usually
Strain_(mechanics)
Unit of length
μέτρον, romanized: metron, lit. 'unit of measurement') is a unit of length in the International System of Units (SI) equal to 10−15 metres, which means
Femtometre
Unit of energy, often used for electrical billing
kilowatt-hour (unit symbol: kW⋅h or kW h; commonly written as kWh) is a non-SI unit of energy equal to 3.6 megajoules (MJ) in SI units, which is the energy
Kilowatt-hour
Measure of electric field through surface
coulomb (N·m2·C−1). Thus, the unit of electric flux expressed in terms of SI base units is kg·m3·s−3·A−1. Its dimensional formula is L3MT−3I−1. Magnetic flux
Electric_flux
Amount of charge flowing through a unit cross-sectional area per unit time
point. In SI base units, the electric current density is measured in amperes per meter square. Consider a small surface with area A (SI unit: m2) centered
Current_density
Physical artifact that formerly defined the kilogram
By 2018, the IPK underpinned the definitions of four of the seven SI base units: the kilogram itself, plus the mole, ampere, and candela (whose definitions
International Prototype of the Kilogram
International_Prototype_of_the_Kilogram
Unit of the auxiliary magnetic field H in the CGS system of units
CGS-Gaussian system of units". SI Brochure: The International System of Units (SI) [8th edition, 2006; updated in 2014]. BIPM. 2006. "SI base unit: ampere (A)"
Oersted
CGS unit of energy and mechanical work
is a unit of energy equal to 10−7 joules (100 nJ). It is not an SI unit, instead originating from the older centimetre–gram–second system of units (CGS)
Erg
SI unit of length
The hectometre (SI symbol: hm), spelt hectometer in American English, is a unit of length in the International System of Units (SI), equal to one hundred
Hectometre
Unit of measurement for measuring volume or capacity
According to the SI system, the base unit for measuring length is the metre. The SI unit of volume is thus the cubic metre, which is a derived unit, where: 1
Unit_of_volume
Physical constant
current. Expressed in terms of SI base units, it has the unit kg⋅m⋅s−2⋅A−2. It can be also expressed in terms of SI derived units, N⋅A−2, H·m−1, or T·m·A−1
Vacuum_permeability
Ratio of the number of particles in a sample to Avogadro's constant
seven base quantities of the International System of Units, SI. The unit of amount of substance in the SI is the mole (symbol: mol), a base unit. Since
Amount_of_substance
the sound energy per unit volume. The SI unit of sound energy density is the pascal (Pa), which is 1 kg⋅m−1⋅s−2 in SI base units or 1 joule per cubic
Sound_energy_density
Collection of units of measurement and rules relating them to each other
serve as the SI base units are the metre, kilogram, second, ampere, kelvin, mole, and candela. Both British imperial units and US customary units derive from
System of units of measurement
System_of_units_of_measurement
Force on a mass due to gravity
measured in SI units. The SI unit of weight is the same as that of force: the newton (N) – a derived unit which can also be expressed in SI base units as kg⋅m/s2
Weight
Radiation unit
more commonly used SI unit outside the United States. Earlier definitions going back to 1945 were derived from the roentgen unit, which was named after
Roentgen_equivalent_man
SI BASE-UNIT
SI BASE-UNIT
Surname or Lastname
French and Swiss (French part)
French and Swiss (French part) : metonymic occupational name for a baker, from Old French bise ‘large round loaf’.English and Scottish : perhaps a variant of Biss. Compare Beese, Bice, Buys, Buys.
Female
English
English pet form of Greek Barbara, BABE means "foreign; strange." Compare with masculine Babe.
Surname or Lastname
English
English : variant of Bach 3.Americanized spelling of German or Jewish Basch.Americanized spelling of Slovenian Baš (see Bas 3).
Male
Hawaiian
Hawaiian name BANE means "long-awaited child."
Surname or Lastname
English
English : probably from a Middle English survival of the Old English personal name Bad(d)a, which is of uncertain origin, perhaps a short form of the various compound names with the first element beadu ‘battle’.North German : from a short form of a Germanic personal name composed with badu ‘strife’, ‘battle’.North German : occupational name from Middle Low German bade ‘messenger’.
Surname or Lastname
English (East Midlands)
English (East Midlands) : variant of Bayes.
Boy/Male
Tamil
Base
Boy/Male
Muslim
Smiling
Boy/Male
Muslim
Eye-sight, Wisdom, Sight
Surname or Lastname
English
English : from Old French bas(se) ‘low’, ‘short’ (Latin bassus ‘thickset’; see Basso), either a descriptive nickname for a short person or a status name meaning ‘of humble origin’, not necessarily with derogatory connotations.English : in some instances, from Middle English bace ‘bass’ (the fish), hence a nickname for a person supposedly resembling this fish, or a metonymic occupational name for a fish seller or fisherman.Scottish : habitational name from a place in Aberdeenshire, of uncertain origin.Jewish (Ashkenazic) : metonymic occupational name for a maker or player of bass viols, from Polish, Ukrainian, and Yiddish bas ‘bass viol’.German : see Basse.
Boy/Male
Indian
Base
Female
Egyptian
, Si-en-ea.
Boy/Male
Hindu
Prosperous, Dweller
Surname or Lastname
German
German : nickname for a swift runner or a timorous person, from Middle High German, Middle Low German hase ‘hare’.Jewish (Ashkenazic) : ornamental name from German Hase ‘hare’.English : from a Middle English nickname, Hase, from Old English hÄs ‘harsh, raucous, or hoarse voice’.Japanese : usually written with characters meaning ‘long valley’; habitational name from a place in Yamato (now Nara prefecture). Listed in the Shinsen shÅjiroku. Some bearers are descended from the Taira clan; they are found mainly in eastern Japan. Also pronounced Nagaya and Nagatani; the original pronunciation was Hatsuse, meaning ‘beginning of the strait’.
Surname or Lastname
English
English : from Anglo-Norman French cas(s)e ‘case’, ‘container’ (from Latin capsa), hence a metonymic occupational name for a maker of boxes or chests.Americanized spelling of French Caisse.Americanized spelling of Kaas.Americanized spelling of German Käse, a metonymic occupational name for a maker or seller of cheese. Compare Kaeser.
Male
English
Short form of English Basil, BAS means "king" or "basil (the herb)."
Female
Yiddish
(בַ×ש×ֶע) Variant spelling of Yiddish Basha, BASHE means "daughter of God."
Surname or Lastname
English and Dutch
English and Dutch : variant spelling of Bay.
Female
Egyptian
, Child of Bast.
Male
Hindi/Indian
Variant form of Hindi Vasu, BASU means "dweller."
SI BASE-UNIT
SI BASE-UNIT
Girl/Female
Tamil
Dipranjan | தீபà¯à®°à®‚ஜந
Boy/Male
Irish
From the stream.
Boy/Male
Tamil
Exile
Boy/Male
Hindu, Indian, Telugu
Doctor of Gods
Boy/Male
Tamil
Giving attention
Boy/Male
Greek
Tame.
Boy/Male
Hindu
Another name of Lord Murugan
Boy/Male
Indian, Punjabi, Sikh
Destroyer of All
Boy/Male
Australian, French, German
Child of Easter
Boy/Male
Hindu
Alternate name of Arjun
SI BASE-UNIT
SI BASE-UNIT
SI BASE-UNIT
SI BASE-UNIT
SI BASE-UNIT
a.
Morally low. Hence: Low-minded; unworthy; without dignity of sentiment; ignoble; mean; illiberal; menial; as, a base fellow; base motives; base occupations.
n.
A box, sheath, or covering; as, a case for holding goods; a case for spectacles; the case of a watch; the case (capsule) of a cartridge; a case (cover) for a book.
n.
A rustic play; -- called also prisoner's base, prison base, or bars.
n.
Same as Prison base.
n.
Species of Serranus, the sea bass and rock bass. See Sea bass.
n.
The bottom of anything, considered as its support, or that on which something rests for support; the foundation; as, the base of a statue.
a.
To abase; to let, or cast, down; to lower.
a.
Deep or grave in sound; as, the base tone of a violin.
n., a., & v.
See Base.
n.
To put on a base or basis; to lay the foundation of; to found, as an argument or conclusion; -- used with on or upon.
a.
Alloyed with inferior metal; debased; as, base coin; base bullion.
a.
Of little, or less than the usual, height; of low growth; as, base shrubs.
imp. & p. p.
of Base
pl.
of Bass
n.
The number from which a mathematical table is constructed; as, the base of a system of logarithms.
a.
Not held by honorable service; as, a base estate, one held by services not honorable; held by villenage. Such a tenure is called base, or low, and the tenant, a base tenant.
n.
A low, or deep, sound. (Mus.) (a) The lowest part; the deepest male voice. (b) One who sings, or the instrument which plays, base.
a.
Having a base, or having as a base; supported; as, broad-based.