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Candela (CD) Sainmhíniú aonaid
The candela is the unit of luminous intensity in the International System of Units (SI). It measures luminous power per unit solid angle emitted by a light source in a particular direction. The candela is represented by the symbol cd.
Luminous intensity is analogous to radiant intensity, but instead of simply adding up the contributions of every wavelength of light in the source's spectrum, the contribution of each wavelength is weighted by the luminosity function. This is the model of the sensitivity of the human eye to different wavelengths, standardized by the CIE and ISO.
A common wax candle emits light with a luminous intensity of approximately one candela. If emission in some directions is blocked by an opaque barrier, the emission would still be approximately one candela in the directions that are not obscured.
The word candela is Latin for candle. The old term "candle" is still sometimes used, as in foot-candle and the more modern definition of candlepower.
SI Multiples
A table of various luminous intensity candela units derived from SI multiples:
Submultiples |
Multiples |
||||||
Scientific Notation |
Luach |
Réimeas |
Ainmnigh |
Scientific Notation |
Luach |
Réimeas |
Ainmnigh |
10-1 cd |
0.1 cd |
Deci (d) | Decicandela (DCD) | 101 cd |
10 cd |
Deca (DA) | Decacandela (DACD) |
10-2 cd |
0.01 cd |
Centi (c) | Centicandela (CCD) | 102 cd |
100 cd |
Hecto (H) | Hectocandela (HCD) |
10-3 cd |
0.001 cd |
Milli (M) | Millicandela (MCD) | 103 cd |
1000 cd |
Kilo (K) | Kilocandela (KCD) |
10-6 cd |
0.000001 cd |
Micrea (µ) | Microcandela (µcd) | 106 cd |
1000000 cd |
Mega (m) | Megacandela (MCD) |
10-9 cd |
0.000000001 cd |
Nano (n) | Nanocandela (NCD) | 109 cd |
1000000000 cd |
Giga (G) | Gigacandela (GCD) |
10-12 cd |
0.000000000001 cd |
Pico (P) | Picocandela (PCD) | 1012 cd |
1000000000000 cd |
Tera (t) | Teracandela (TCD) |
10-15 cd |
0.000000000000001 cd |
Femto (F) | Femtocandela (FCD) | 1015 cd |
1000000000000000 cd |
PETA (P) | Petacandela (PCD) |
10-18 cd |
0.000000000000000001 cd |
Atto (a) | Attacandela (ACD) | 1018 cd |
1000000000000000000 cd |
Exa (e) | Exacandela (ECD) |
10-21 cd |
0.000000000000000000001 cd |
Zepto (z) | Zeptocandela (ZCD) | 1021 cd |
1000000000000000000000 cd |
Zetta (Z) | Zettacandela (ZCD) |
10-24 cd |
0.000000000000000000000001 cd |
Yocto (y) | Yoctocandela (YCD) | 1024 cd |
1000000000000000000000000 cd |
Yotta (Y) | Yottacandela (YCD) |
10-27 cd |
0.000000000000000000000000001 cd |
Ronto (r) | Rontocandela (rcd) | 1027 cd |
1000000000000000000000000000 cd |
Ronna (R) | Ronnacandela (Rcd) |
10-30 cd |
0.000000000000000000000000000001 cd |
Quecto (q) | Quectocandela (qcd) | 1030 cd |
1000000000000000000000000000000 cd |
Quetta (Q) | Quettacandela (Qcd) |
Other Luminous Intensity Unit Definitions
- Attacandela (ACD)
Deachúil Bougie (b)
- Candela (CD)
Candle Germany (coinneal)
Candle International (coinneal)
Candle nua (coinneal)
Candlepower (CP)
Candlepower Old (CP)
Aonad Carcel (Carcel-Unit)
- Centicandela (CCD)
- Decacandela (DACD)
- Decicandela (DCD)
Coinnle Deachúil (DC)
- Dekacandela (dacd)
- Exacandela (ECD)
- Femtocandela (FCD)
- Gigacandela (GCD)
- Hectocandela (HCD)
Aonad Hefner (HK)
- Kilocandela (KCD)
Lumen in aghaidh an Steradian (LM/SR)
- Megacandela (MCD)
- Microcandela (μCD)
- Millicandela (MCD)
- Nanocandela (NCD)
Coinnle Pentane (PC)
- Petacandela (PCD)
- Picocandela (PCD)
- Quectocandela (qcd)
- Quettacandela (Qcd)
- Ronnacandela (Rcd)
- Rontocandela (rcd)
- Teracandela (TCD)
Votaint (Votaint)
- Yoctocandela (YCD)
- Yottacandela (YCD)
- Zeptocandela (ZCD)
- Zettacandela (ZCD)
Convert to Another Luminous Intensity Unit
Sainmhínithe gaolmhara
Séanadh
Cé go bhfuil gach iarracht déanta chun an tiontaire aonaid seo a thástáil, ní féidir linn a bheith faoi dhliteanas i leith aon damáistí speisialta, teagmhasacha, indíreacha nó iarmhartacha nó caillteanais airgeadaíochta de chineál ar bith a eascraíonn as nó i dtaca le húsáid aon cheann de na huirlisí tiontaire agus faisnéis a fuarthas ón láithreán gréasáin seo. Cuirtear an tiontaire aonaid seo ar fáil mar sheirbhís duit, bain úsáid as do riosca féin le do thoil. Ná bain úsáid as ríomhanna le haghaidh aon rud ina bhféadfadh cailliúint saoil, airgead, maoin, srl.
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Foinsíocht
“Candela.” Wikipedia, Wikimedia Foundation, 4 Sept. 2023, en.wikipedia.org/wiki/Candela.