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{{anchor|table-si-radiometry-units}}
{|class="wikitable" style="margin: 1em auto 1em auto"
|+ {{navbar-header |1={{resize|130%|{{#if:{{{1|}}}|Table {{{1}}}. }}SI radiometry units}}|2=SI radiometry units}}
|-
! colspan="2" | Quantity
! colspan="2" | Unit
! Dimension
! rowspan="2" | Notes
|-
! Name
! Symbol{{#tag:ref|[[Standards organization]]s recommend that radiometric [[Physical quantity|quantities]] should be denoted with suffix "e" (for "energetic") to avoid confusion with photometric or [[photon]] quantities.|group={{#if:{{{3|}}}|{{{3}}}|nb}}|name=note-suffix-e}}
! scope="col" style="width: 10em;"|Name
! Symbol
! Symbol
|-
| [[Radiant energy]]
| ''Q''e{{#tag:ref|Alternative symbols sometimes seen: ''W'' or ''E'' for radiant energy, ''P'' or ''F'' for radiant flux, ''I'' for irradiance, ''W'' for radiant exitance.|group={{#if:{{{3|}}}|{{{3}}}|nb}}|name=note-alternative-symbol-radiometric}}
| [[joule]]
| [[Joule|J]]
| '''M'''⋅'''L'''2⋅'''T'''−2
| Energy of electromagnetic radiation.
|-
| style=white-space:nowrap | [[Radiant energy density]]
| ''w''e
| joule per cubic metre
| J/m3
| '''M'''⋅'''L'''−1⋅'''T'''−2
| Radiant energy per unit volume.
|-
| [[Radiant flux]]
| Φe{{#tag:ref||group={{#if:{{{3|}}}|{{{3}}}|nb}}|name=note-alternative-symbol-radiometric}}
| [[watt]]
| [[Watt|W]] = J/s
| '''M'''⋅'''L'''2⋅'''T'''−3
| Radiant energy emitted, reflected, transmitted or received, per unit time. This is sometimes also called "radiant power", and called [[luminosity]] in Astronomy.
|-
| rowspan=2 | [[Radiant flux|Spectral flux]]
| Φe,''ν''{{#tag:ref|Spectral quantities given per unit [[frequency]] are denoted with suffix "''[[ν]]''" (Greek letter [[Nu (letter)|nu]], not to be confused with a letter "v", indicating a photometric quantity.)|group={{#if:{{{3|}}}|{{{3}}}|nb}}|name=note-suffix-nu}}
| watt per [[hertz]]
| W/[[Hertz|Hz]]
| '''M'''⋅'''L'''2⋅'''T'''−2
| rowspan=2 | Radiant flux per unit frequency or wavelength. The latter is commonly measured in W⋅nm−1.
|-
| Φe,''λ''{{#tag:ref|Spectral quantities given per unit [[wavelength]] are denoted with suffix "''[[λ]]''".|group={{#if:{{{3|}}}|{{{3}}}|nb}}|name=note-suffix-lambda}}
| watt per metre
| W/m
| '''M'''⋅'''L'''⋅'''T'''−3
|-
| [[Radiant intensity]]
| ''I''e,Ω{{#tag:ref|Directional quantities are denoted with suffix "[[Ω]]".|group={{#if:{{{3|}}}|{{{3}}}|nb}}|name=note-suffix-omega}}
| watt per [[steradian]]
| W/[[steradian|sr]]
| '''M'''⋅'''L'''2⋅'''T'''−3
| Radiant flux emitted, reflected, transmitted or received, per unit solid angle. This is a ''directional'' quantity.
|-
| rowspan=2 | [[Radiant intensity|Spectral intensity]]
| ''I''e,Ω,''ν''{{#tag:ref||group={{#if:{{{3|}}}|{{{3}}}|nb}}|name=note-suffix-nu}}
| watt per steradian per hertz
| W⋅sr−1⋅Hz−1
| '''M'''⋅'''L'''2⋅'''T'''−2
| rowspan=2 | Radiant intensity per unit frequency or wavelength. The latter is commonly measured in W⋅sr−1⋅nm−1. This is a ''directional'' quantity.
|-
| ''I''e,Ω,''λ''{{#tag:ref||group={{#if:{{{3|}}}|{{{3}}}|nb}}|name=note-suffix-lambda}}
| watt per steradian per metre
| W⋅sr−1⋅m−1
| '''M'''⋅'''L'''⋅'''T'''−3
|-
| [[Radiance]]
| ''L''e,Ω{{#tag:ref||group={{#if:{{{3|}}}|{{{3}}}|nb}}|name=note-suffix-omega}}
| watt per steradian per square metre
| W⋅sr−1⋅m−2
| '''M'''⋅'''T'''−3
| Radiant flux emitted, reflected, transmitted or received by a ''surface'', per unit solid angle per unit projected area. This is a ''directional'' quantity. This is sometimes also confusingly called "intensity".
|-
| rowspan=2 style=white-space:nowrap | [[Spectral radiance]]Specific intensity
| ''L''e,Ω,''ν''{{#tag:ref||group={{#if:{{{3|}}}|{{{3}}}|nb}}|name=note-suffix-nu}}
| watt per steradian per square metre per hertz
| W⋅sr−1⋅m−2⋅Hz−1
| '''M'''⋅'''T'''−2
| rowspan=2 | Radiance of a ''surface'' per unit frequency or wavelength. The latter is commonly measured in W⋅sr−1⋅m−2⋅nm−1. This is a ''directional'' quantity. This is sometimes also confusingly called "spectral intensity".
|-
| ''L''e,Ω,''λ''{{#tag:ref||group={{#if:{{{3|}}}|{{{3}}}|nb}}|name=note-suffix-lambda}}
| watt per steradian per square metre, per metre
| W⋅sr−1⋅m−3
| '''M'''⋅'''L'''−1⋅'''T'''−3
|-
| [[Irradiance]] [[Flux density]]
| ''E''e{{#tag:ref||group={{#if:{{{3|}}}|{{{3}}}|nb}}|name=note-alternative-symbol-radiometric}}
| watt per square metre
| W/m2
| '''M'''⋅'''T'''−3
| Radiant flux ''received'' by a ''surface'' per unit area. This is sometimes also confusingly called "intensity".
|-
| rowspan=2 style=white-space:nowrap | [[Irradiance|Spectral irradiance]] [[Spectral flux density]]
| ''E''e,''ν''{{#tag:ref||group={{#if:{{{3|}}}|{{{3}}}|nb}}|name=note-suffix-nu}}
| watt per square metre per hertz
| W⋅m−2⋅Hz−1
| '''M'''⋅'''T'''−2
| rowspan=2 | Irradiance of a ''surface'' per unit frequency or wavelength. This is sometimes also confusingly called "spectral intensity". Non-SI units of spectral flux density include [[jansky]] (1 Jy = 10−26 W⋅m−2⋅Hz−1) and [[solar flux unit]] (1 sfu = 10−22 W⋅m−2⋅Hz−1 = 104 Jy).
|-
| ''E''e,''λ''{{#tag:ref||group={{#if:{{{3|}}}|{{{3}}}|nb}}|name=note-suffix-lambda}}
| watt per square metre, per metre
| W/m3
| '''M'''⋅'''L'''−1⋅'''T'''−3
|-
| [[Radiosity (radiometry)|Radiosity]]
| ''J''e{{#tag:ref||group={{#if:{{{3|}}}|{{{3}}}|nb}}|name=note-alternative-symbol-radiometric}}
| watt per square metre
| W/m2
| '''M'''⋅'''T'''−3
| Radiant flux ''leaving'' (emitted, reflected and transmitted by) a ''surface'' per unit area. This is sometimes also confusingly called "intensity".
|-
| rowspan=2 | [[Radiosity (radiometry)|Spectral radiosity]]
| ''J''e,''ν''{{#tag:ref||group={{#if:{{{3|}}}|{{{3}}}|nb}}|name=note-suffix-nu}}
| watt per square metre per hertz
| W⋅m−2⋅Hz−1
| '''M'''⋅'''T'''−2
| rowspan=2 | Radiosity of a ''surface'' per unit frequency or wavelength. The latter is commonly measured in W⋅m−2⋅nm−1. This is sometimes also confusingly called "spectral intensity".
|-
| ''J''e,''λ''{{#tag:ref||group={{#if:{{{3|}}}|{{{3}}}|nb}}|name=note-suffix-lambda}}
| watt per square metre, per metre
| W/m3
| '''M'''⋅'''L'''−1⋅'''T'''−3
|-
| [[Radiant exitance]]
| ''M''e{{#tag:ref||group={{#if:{{{3|}}}|{{{3}}}|nb}}|name=note-alternative-symbol-radiometric}}
| watt per square metre
| W/m2
| '''M'''⋅'''T'''−3
| Radiant flux ''emitted'' by a ''surface'' per unit area. This is the emitted component of radiosity. "Radiant emittance" is an old term for this quantity. This is sometimes also confusingly called "intensity".
|-
| rowspan=2 | [[Radiant exitance|Spectral exitance]]
| ''M''e,''ν''{{#tag:ref||group={{#if:{{{3|}}}|{{{3}}}|nb}}|name=note-suffix-nu}}
| watt per square metre per hertz
| W⋅m−2⋅Hz−1
| '''M'''⋅'''T'''−2
| rowspan=2 | Radiant exitance of a ''surface'' per unit frequency or wavelength. The latter is commonly measured in W⋅m−2⋅nm−1. "Spectral emittance" is an old term for this quantity. This is sometimes also confusingly called "spectral intensity".
|-
| ''M''e,''λ''{{#tag:ref||group={{#if:{{{3|}}}|{{{3}}}|nb}}|name=note-suffix-lambda}}
| watt per square metre, per metre
| W/m3
| '''M'''⋅'''L'''−1⋅'''T'''−3
|-
| [[Radiant exposure]]
| ''H''e
| joule per square metre
| J/m2
| '''M'''⋅'''T'''−2
| Radiant energy received by a ''surface'' per unit area, or equivalently irradiance of a ''surface'' integrated over time of irradiation. This is sometimes also called "radiant fluence".
|-
| rowspan=2 | [[Radiant exposure|Spectral exposure]]
| ''H''e,''ν''{{#tag:ref||group={{#if:{{{3|}}}|{{{3}}}|nb}}|name=note-suffix-nu}}
| joule per square metre per hertz
| J⋅m−2⋅Hz−1
| '''M'''⋅'''T'''−1
| rowspan=2 | Radiant exposure of a ''surface'' per unit frequency or wavelength. The latter is commonly measured in J⋅m−2⋅nm−1. This is sometimes also called "spectral fluence".
|-
| ''H''e,''λ''{{#tag:ref||group={{#if:{{{3|}}}|{{{3}}}|nb}}|name=note-suffix-lambda}}
| joule per square metre, per metre
| J/m3
| '''M'''⋅'''L'''−1⋅'''T'''−2
|-
| style="text-align:center;" colspan=9 |See also: [[SI]]{{·}} [[Radiometry]]{{·}} [[Photometry (optics)|Photometry]]{{#if:{{{2|}}}|{{·}} ([[{{#ifeq:{{{2}}}|self||Photometry (optics)}}#table-si-photometry-units{{!}}Compare]])}}
|}
{{#if:{{{3|}}}||{{Reflist|group=nb}}}}<noinclude>
{{Documentation}}

</noinclude>

Template:SI radiometry units - Revision history

Indicwiki: 1 revision imported from :alpha:Template:SI_radiometry_units

alpha>Indicwiki: Created page with "{{anchor|table-si-radiometry-units}} {|class="wikitable" style="margin: 1em auto 1em auto" |+ {{navbar-header |1={{resize|130%|{{#if:{{{1|}}}|Table {{{1}}}. }}SI rad..."