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The Non-SI Units of Radiation
The Non-SI Units of Radiation
Published: 2015/12/13
Channel: Max Oerlemans
How to convert units easily - converting non SI units into SI units tutorial
How to convert units easily - converting non SI units into SI units tutorial
Published: 2015/10/12
Channel: Science and Engineering help
Non-SI Units and the Equation Mapping Technique
Non-SI Units and the Equation Mapping Technique
Published: 2016/08/25
Channel: DoctorBear
SI Units and Metric Conversions
SI Units and Metric Conversions
Published: 2014/09/07
Channel: Nicole Stratton
What If the Arabian Empire Reunited Today?
What If the Arabian Empire Reunited Today?
Published: 2017/04/21
Channel: RealLifeLore
PREFIXES USED IN THE SI SYSTEM
PREFIXES USED IN THE SI SYSTEM
Published: 2017/02/17
Channel: 7activestudio
Estrarre disco bloccato dentro dvd che non si apre | Tips & Tricks
Estrarre disco bloccato dentro dvd che non si apre | Tips & Tricks
Published: 2016/02/27
Channel: thesilentube83
Ionizing Radiation "Quantities and Units" P5
Ionizing Radiation "Quantities and Units" P5
Published: 2010/01/13
Channel: KSUinformation
Why the metric system matters - Matt Anticole
Why the metric system matters - Matt Anticole
Published: 2016/07/21
Channel: TED-Ed
What is SI units
What is SI units
Published: 2014/10/27
Channel: Pearson India
SI base units and other derived units
SI base units and other derived units
Published: 2014/06/21
Channel: Understanding Physics
DEFINITIONS OF SI BASE UNITS
DEFINITIONS OF SI BASE UNITS
Published: 2017/02/16
Channel: 7activestudio
SSD con più memoria al mondo | Seagate 60 TB - non si sa cosa
SSD con più memoria al mondo | Seagate 60 TB - non si sa cosa
Published: 2016/08/18
Channel: Computer In Due
What Is The Unit Of Acceleration In The SI System?
What Is The Unit Of Acceleration In The SI System?
Published: 2017/07/22
Channel: tell sparky
How to Convert Gal/Min to SI Units : Math Conversions
How to Convert Gal/Min to SI Units : Math Conversions
Published: 2012/07/09
Channel: expertvillage
Chapter 10-Force Method for Frames (SI Units)
Chapter 10-Force Method for Frames (SI Units)
Published: 2013/03/29
Channel: Maen Abdulhaq
DI BELLA, SIMONCINI ED ALTRI. SONO TRUFFA SOLO PERCHE
DI BELLA, SIMONCINI ED ALTRI. SONO TRUFFA SOLO PERCHE' NON SI PIEGANO ALLE MULTINAZIONALI?
Published: 2013/09/08
Channel: ACCADEMIA DELLA LIBERTA'
Day 3 - Units - Base, Derived, Non-SI - Quiz
Day 3 - Units - Base, Derived, Non-SI - Quiz
Published: 2015/08/25
Channel: Mr. Science Teacher ®
Day 3 - Units - Base, Derived, Non-SI
Day 3 - Units - Base, Derived, Non-SI
Published: 2015/08/25
Channel: Mr. Science Teacher ®
FRENCH: Answering questions with  OUI/NON/SI
FRENCH: Answering questions with OUI/NON/SI
Published: 2015/06/11
Channel: 아줌마라고부르지마시오
iPhone 8... non si chiamerà così!
iPhone 8... non si chiamerà così!
Published: 2017/06/22
Channel: iPhoneItalia
IB Section 1 4 SI units of Measurements
IB Section 1 4 SI units of Measurements
Published: 2015/09/02
Channel: Jmarti13aisd
Relating Derived Units to the Seven SI Standards
Relating Derived Units to the Seven SI Standards
Published: 2012/11/03
Channel: silencedidgood
What Is Pressure What Is The SI Unit Of Pressure?
What Is Pressure What Is The SI Unit Of Pressure?
Published: 2017/08/15
Channel: sandy sandy
[2015] Engineering Fundamentals 02: Unit systems. SI unit system [with closed caption]
[2015] Engineering Fundamentals 02: Unit systems. SI unit system [with closed caption]
Published: 2015/01/12
Channel: Yiheng Wang
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Far Cry 5 - Nel Montana di Far Cry non si spara soltanto [Extended Walkthrough]
Published: 2017/08/23
Channel: Ubisoft Italia
Physics-Prefixes for SI Units
Physics-Prefixes for SI Units
Published: 2016/04/05
Channel: Study & You
Tricks to Memorizing SI Prefixes : Math Conversions
Tricks to Memorizing SI Prefixes : Math Conversions
Published: 2012/07/02
Channel: expertvillage
Radiation Measurements (Exposure in Air)
Radiation Measurements (Exposure in Air)
Published: 2017/06/01
Channel: RadTechBootCamp
BCLN - SI Units - Chemistry
BCLN - SI Units - Chemistry
Published: 2013/08/08
Channel: B CLN
World
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Published: 2013/03/25
Channel: Veritasium
Chapter 12-Moment Distribution with Modified Stiffness (SI Units)
Chapter 12-Moment Distribution with Modified Stiffness (SI Units)
Published: 2013/03/30
Channel: Maen Abdulhaq
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Perché non si walla con due cittadini - Age of Empires 2 HD
Published: 2016/10/25
Channel: Jake Sieghardt
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Converting SI units - km to cm Made EZ.
Published: 2016/02/24
Channel: Avicenna Edu
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Published: 2014/04/01
Channel: EasyToLearn French
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Video on Metric System, SI Units, Unit Conversions, and Dimensional Analysis
Published: 2017/01/25
Channel: CroftScienceVideos
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What Is The Unit Of Entropy?
Published: 2017/07/15
Channel: sparky TIME
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Published: 2017/07/12
Channel: Redazione Calabrianews24
What Are The Different Units Of Force
What Are The Different Units Of Force
Published: 2017/07/15
Channel: simple sparky
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What Is The SI Unit Of Energy?
Published: 2017/08/31
Channel: Ask Question
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What Is The Standard Unit Of Pressure?
Published: 2017/08/19
Channel: Til Til
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Published: 2017/08/25
Channel: HDblog
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Converting Between SI Units and SI Units 2.wmv
Published: 2011/12/16
Channel: Steve Watkins
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PHYSICS SI UNITS FOR RRB NTPC ,SSC CGL AND OTHER GENERAL EXAMS
Published: 2016/03/13
Channel: Simply Learn with RaJ
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Published: 2017/07/25
Channel: alaNEWS
SI GANAKA
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Published: 2011/01/17
Channel: youtube KyaliApps
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Published: 2017/08/14
Channel: e-penser
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Published: 2012/10/31
Channel: DiamondCrafterITA
What Are The Units Of F MA?
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Published: 2017/07/14
Channel: sparky SPARKS
si units of measurement for kids
si units of measurement for kids
Published: 2017/07/18
Channel: Learning Videos Best For Kids
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WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
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This is a list of units that are not defined as part of the International System of Units (SI), but are otherwise mentioned in the SI,[1][2] because either the General Conference on Weights and Measures (CGPM) accepts their use as being multiples or submultiples of SI-units, they have important contemporary application worldwide, or are otherwise commonly encountered worldwide.

Units officially accepted for use with the SI[edit]

Name Symbol Quantity Equivalent SI unit
Widely used units expected to be used indefinitely
minute min time (SI unit multiple) 1 min = 60 s
hour h time (SI unit multiple) 1 h = 60 min = 3600 s
day d time (SI unit multiple) 1 d = 24 h = 1440 min = 86400 s
degree ° plane angle (dimensionless unit) 1° = (π / 180) rad
minute plane angle (dimensionless unit) 1′ = (1 / 60)° = (π / 10800) rad
second plane angle (dimensionless unit) 1″ = (1 / 60)′ = (1 / 3600)° = (π / 648000) rad
hectare ha area (decimal unit multiple) 1 ha = 100 a = 10000 m2 = 1 hm2
litre l or L volume (decimal unit multiple) 1 L = 1 dm3 = 0.001 m3 = 1000 cm3
tonne t mass (decimal unit multiple) 1 t = 103 kg = 1 Mg
astronomical unit au or AU[1][3] length 1 AU = 1.495978707×1011 m (exact)
Logarithmic units
neper Np level of a field quantity 1 Np = 1[4]
    level of a power quantity 1 Np = 1[5]
bel B level of a field quantity 1 B = ln(10)/2 Np = ln(10)/2[6]
    level of a power quantity
decibel dB level of a field quantity 1 dB = 0.1 B [7]
    level of a power quantity
Units with experimentally determined values
electronvolt eV energy 1 eV = 1.60217653(14)×10−19 J
unified atomic mass unit
dalton
u
Da
mass 1 u = 1 Da = 1.66053886(28)×10−27 kg
Natural units (n.u.)
n.u. of speed (speed of light in vacuum) c0 speed 299792458 m/s (exact)[8]
n.u. of action (reduced Planck constant) ħ action 1.05457168(18)×10−34 J·s
n.u. of mass (electron mass) me mass 9.1093826(16)×10−31 kg
n.u. of time ħ / mec02 time 1.2880886677(86)×10−21 s
Atomic units (a.u.)
a.u. of charge (elementary charge) e electric charge 1.60217653(14)×10−19 C
a.u. of mass (electron mass) me mass 9.1093826(16)×10−31 kg
a.u. of action (reduced Planck constant) ħ action 1.05457168(18)×10−34 J·s
a.u. of length, bohr (Bohr radius) a0 length 0.5291772108(18)×10−10 m
a.u. of energy, hartree (Hartree energy) Eh energy 4.35974417(75)×10−18 J
a.u. of time ħ / Eh time 2.418884326505(16)×10−17 s

Common units not officially sanctioned[edit]

Name Symbol Quantity Equivalent SI unit
ångström, angstrom Å length 1 Å = 0.1 nm = 10−10 m = 100 pm
are a area 1 a = 1 dam2 = 100 m2
barn b area 1 b = 10−28 m2
bar bar pressure 1 bar = 105 Pa
millibar mbar pressure 1 mbar = 1 hPa = 100 Pa
atmosphere atm pressure 1 atm = 1013.25 mbar = 1013.25 hPa = 101325 Pa exactly (commonly used in atmospheric meteorology, in oceanography and for pressures within liquids, or in the industry for pressures within containers of liquefied gas)
dyne per square centimetre (barye) Ba pressure 1 Ba = 0.1 Pa = 0.1 N/m2 = 100 g·cm−1·s−2
millimetre of mercury mmHg pressure 1 mmHg = 133.322387415 Pa at 0 °C = 133.322387415 N/m2 at 0 °C = 133.322387415 kg·cm−1·s−2 at 0 °C
torr Torr pressure 1 Torr = 1/760 atm = 133.322368421... Pa = 133.322368421... N/m2 = 133.322368421... kg·cm−1·s−2

See also[edit]

References[edit]

  1. ^ a b "Units outside the SI". SI brochure (8th edition). BIPM. 2014 [2008]. Retrieved 2015-06-16. 
  2. ^ Taylor, Barry N. (ed.) (2001). "The International System of Units (SI)" (PDF). Special Publication 330. Gaithersburg, Maryland: National Institute of Standards and Technology (NIST). 
  3. ^ "Manuscript Preparation: AJ & ApJ Author Instructions". American Astronomical Society. Retrieved 2015-06-15. 
  4. ^ LF = ln(F / F0) Np
  5. ^ LP = 12 ln(P / P0) Np
  6. ^ LF = 2 log10(F / F0) B
  7. ^ LP = log10(P / P0) B
  8. ^ In this case it is not the speed of light, but the length of the metre that is obtained by experiment

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