Search results

[[Category:Units of energy]] [[Category:Non-SI metric units]] ...

[[Category:Units of energy]] [[Category:Non-SI metric units]] ...

| caption = The [[Metric system|metric]] length of one [[kilometre]] is equivalent to the [[imperial measurement]] ..., from which all other units are derived. In the [[International System of Units]] (SI) system the base unit for length is the [[metre]]. ...

{{Short description|Imperial and US customary (non-metric) unit of volume}} | standard = [[Imperial units|Imperial]] and [[US Customary]] ...

...unit for specific energy is the [[joule]] per [[kilogram]] (J/kg). Other units still in use worldwide in some contexts are the [[kilocalorie]] per gram (C ...stry]], that is energy per [[mole (unit)|mole]] of a substance, which uses units such as joules per mole, or the older but still widely used [[calorie]]s pe ...

...agram with units and terminology.|thumb|372x372px|Illuminance diagram with units and terminology.]] In [[SI derived units|SI units]] illuminance is measured in [[lux]] (lx), or equivalently in [[lumen (unit ...

| standard = Non-SI metric | units3 = [[English Engineering units]] ...

...etic fields characterizes the bivector ''F'' in relation to the Lorentzian metric {{nowrap|1=''η'' = ''η''_''ab''}} by defining and examining the s ...up>ac</sup>''η''_''cb''}} defined by lowering one index with the metric. It acts on the tangent space at ''p'' by {{nowrap|''r''^''a'' → ...

===Units=== {{Main|Units of energy}} ...

...cal purposes, concepts such as the average temperature of the universe (in units of eV) or the particle horizon are used when the early universe is the obje ...d time coordinate for specifying the [[Friedmann–Lemaître–Robertson–Walker metric|Friedmann–Lemaître–Robertson–Walker solutions]] of [[Einstein field equatio ...

...sian units]], not [[SI units]] are used. (To convert to SI, see [[Gaussian units|here]].) By [[Einstein notation]], we implicitly take the sum over all valu ...ectromagnetic tensor]]) can be written as a 2-form in Minkowski space with metric signature {{math|(− + + +)}} as ...

...]] in [[free space]]. The equations above are in [[International System of Units|SI]]. In [[CGS]] these equations can be derived by replacing <math>\frac{1} ...escriptions of materials such as [[electric permittivity]]), and uses [[SI units]]. ...

...y energy supply of 162,494 [[Kilowatt hour#Watt hour multiples and billing units|TWh]] (or 13,792 [[tonne of oil equivalent|Mtoe]]) by region in 2017 (IEA, ...easurements.<ref name="NRCan" /> For electricity, a typical value is three units of source energy for one unit of site energy.<ref>{{cite web|title=Site Ene ...

...ection is typically denoted {{math|''σ''}} ([[sigma]]) and is expressed in units of area, more specifically in [[barn (unit)|barn]]s. In a way, it can be th ...rea). It is important to note that although the cross section has the same units as area, the cross section may not necessarily correspond to the actual phy ...

...antaneous values of the fields and densities (in [[International System of Units]])<ref name=Stewart2003>{{cite journal |last=Stewart |first=A. M. |year=200 The Lorenz gauge is given, in [[SI]] units, by: ...

* [[Metric prefix]] ...le=ISO 2955-1974: lnformation processing - Representations of SI and other units for use in systems with limited character sets |edition=1 |date=1974}}</ref ...

.../physics.nist.gov/cuu/Units/units.html | work=NIST reference on constants, units, and uncertainty |date=12 April 2010 | publisher=National Institute of Stan ...nd magnetic field {{math|'''B'''}}, is given by (in [[SI units]]<ref name="units" />):<ref name="Jackson2" /> ...

...ive. This is a very favorable situation, and made absorbance an absorption metric far preferable to absorption fraction (absorptance). This is the case for w ...[[high-performance liquid chromatography]] applications, often in derived units such as the milli-absorbance unit (mAU) or milli-absorbance unit-minutes (m ...

...llon]] (mpg), for example in the US and usually also in the UK ([[Imperial units|imperial]] gallon); there is sometimes confusion as the imperial gallon is ...(MJ), [[kilowatt-hours]] (kW·h), kilocalories (kcal) or [[British thermal units]] (BTU). The inverse of "energy efficiency" is "[[energy intensity]]", or t ...

...ics.nist.gov/cgi-bin/cuu/Value?c | title =The NIST Reference on Constants, Units, and Uncertainty}}</ref> Known as [[electromagnetic radiation]], these wave ...y we would now call {{math|1/{{sqrt|''ε''{{sub|0}}''μ''{{sub|0}}}}}}, with units of velocity, was directly measured before Maxwell's equations, in an 1855 e ...