swedeteam.sarkinen.com - Resting place for former swedeteam.com

SwedeTeam More Details on SI Units

Seven bases units (Table 1), growing number of Derived SI Units with Special Names and Symbols (Table 2), and Examples of Units including SI Units (Table 3).

Table 1: Base Units (Seven)

Physical quantity Name Symbol
Length, distance meter m
Mass, weight kilogram kg
Time second s
Electric current ampere A
Thermodynamic temperature kelvin K
Amount of substance mole mol
Luminous intensity candela cd

 

Table 2: Derived SI Units with Special Names and Symbols

Physical quantity Name Symbol Dimensions of unit
derived base
Plane angle radian rad   m · m–1 = 1
Solid angle steradian sr   m2 · m–2 = 1
Celsius temperature degree Celsius °C   K
Electric capacitance farad F C/V m–2 · kg–1 · s4 · A2
Electric charge coulomb C   s · A
Electric conductance siemens S A/V m–2 · kg–1 · s3 · A2
Electric potential difference volt V W/A m2 · kg · s–3 · A–1
Electric resistance ohm omega V/A m2 · kg · s–3 · A–2
Energy joule J N · m m2 · kg · s–2
Force newton N   m · kg · s–2
Frequency hertz Hz   s–1
Illuminance lux lx lm/m2 m2 · m–4 · cd = m–2 · cd
Inductance henry H Wb/A m2 · kg · s–2 · A–2
Luminous flux lumen lm cd · sr m2 · m–2 · cd = cd
Power watt W J/s m2 · kg · s–3
Pressure pascal Pa N/m2 m–1 · kg · s–2
Magnetic flux weber Wb V · s m2 · kg · s–2 · A–1
Magnetic flux density tesla T Wb/m2 kg · s–2 · A–1
Activity (referred
to a radionuclide)		 becquerel Bq   s–1
Absorbed dose, specific
energy (imparted), kerma		 gray Gy J/kg m2 · s–2
Dose equivalent,
ambient dose equivalent,
directional dose equivalent,
personal dose equivalent,
organ equivalent dose		 sievert Sv J/kg m2 · s–2
Catalytic activity katal kat   s–1 · mol

 

Table 3: Examples of Units including SI Units

Physical quantity Name Symbol Dimensions of unit
base
dynamic viscosity pascal second Pa · s m–1 · kg · s–1
moment of force newton metre N · m m2 · kg · s–2
surface tension newton per metre N/m kg · s–2
angular velocity radian per second rad/s m · m–1 · s–1 = s–1
angular acceleration radian per second squared rad/s2 m · m–1 · s–2 = s–2
heat flux density, irradiance watt per square metre W/m2 kg · s–3
heat capacity, entropy joule per kelvin J/K m2 · kg · s–2 · K–1
specific heat capacity, specific entropy joule per kilogram kelvin J/(kg · K) m2 · s–2 · K–1
specific energy joule per kilogram J/kg m2 · s–2
thermal conductivity watt per metre kelvin W/(m · K) m · kg · s–3 · K–1
energy density joule per cubic metre J/m3 m–1 · kg · s–2
electric field strength volt per metre V/m m · kg · s–3 · A–1
electric charge density coulomb per cubic metre C/m3 m–3 · s · A
electric flux density coulomb per square metre C/m2 m–2 · s · A
permittivity farad per metre F/m m–3 · kg–1 · s4 · A2
permeability henry per metre H/m m · kg · s–2 · A–2
molar energy joule per mole J/mol m2 · kg · s–2 · mol–1
molar entropy, molar heat capacity joule per mole kelvin J/(mol · K) m2 · kg · s–2 · K–1 · mol–1
exposure (x and gamma rays) coulomb per kilogram C/kg kg–1 · s · A
absorbed dose rate gray per second Gy/s m2 · s–3
radiant intensity watt per steradian W/sr m4 · m–2 · kg · s–3 = m2 · kg · s–3
radiance watt per square metre steradian W/(m2 · sr) m2 · m–2 · kg · s–3 = kg · s–3
catalytic (activity) concentration katal per cubic metre kat/m3 m–3 · s–1 · mol

 

Table 4: Units outside the SI that are accepted for use with the SI

Name Symbol Base SI unit Dimensions of unit
Value in SI units
minute (time) min s (second) 1 min = 60 s
hour (time) h s (second) 1 h = 60 min = 3600 s
day (time) d s (second) 1 d = 24 h = 86 400 s
degree (angle) ° rad (radian) 1° = ( pi/180) rad
minute (angle) ' rad (radian) 1' = (1/60)° = (pi/10 800) rad
second (angle) '' rad (radian) 1'' = (1/60)' = (pi/648 000) rad
liter (volume) L m (meter) 1 L = 1 dm3 = 10-3 m3
metric ton (tonne) (weight) t kg (kilogram) 1 t = 103 kg
neper (relative magnitude) Np - (a ratio) 1 Np = 1 (number one)
bel (relative magnitude) B - (a ratio) 1 B = (1/2) ln 10 Np
  More common is the use including the deci prefix - decibel (dB). wikipedia.org/wiki/Decibel
electronvolt (kinetic energy) eV J (Joule) 1 eV = 1.602 18 x 10-19 J, approximately
unified atomic mass unit u kg (kilogram) 1 u = 1.660 54 x 10-27 kg, approximately
astronomical unit ua m (meter) 1 ua = 1.495 98 x 1011 m, approximately

Read More, Sources