SI derived unit
radian
rad
standard unit of angular measure, an angle that creates an arc in a circle equal in length to that circle's radius (roughly 57.3 degrees); as a ratio of two lengths, it has no dimension
SI derived unit
rad^2
steradian
sr
standard unit of solid angle measure, it is the solid angle which cuts out an area on a sphere that is the square of the sphere's radius; as a ratio of two areas, it has no dimension
SI derived unit
1/s
hertz
Hz
unit of frequency meaning one cycle per second
SI derived unit
1e-3 kg
gram
g
unit of mass equal to one thousandth of a kilogram
SI derived unit
m.kg/s^2
newton
N
unit of force; the amount needed to accelerate 1 kilogram of mass at the rate of 1 metre per second squared
SI derived unit
N/m^2
pascal
Pa
unit of pressure (force per unit area) equal to one newton per square meter
SI derived unit
N.m
joule
J
standard unit of work or energy, equal to the work done by a force of one newton acting along a distance of one meter
SI derived unit
J/s
watt
W
standard unit of power, equivalent to one joule per second, and equal to one ampere flowing across a potential difference of one volt
SI derived unit
s.A
coulomb
C
standard unit of electric charge, the quantity of electricity transported in one second by a current of one ampere
SI derived unit
W/A
volt
V
standard unit of electric potential difference (and electromotive force); the difference of potential between two points of a conductor carrying a constant current of one ampere and dissipating one watt of power
SI derived unit
C/V
farad
F
standard unit of capacitance; the amount which, when a capacitor is charged to a potential difference of one volt, carries a charge of one coulomb
SI derived unit
V/A
ohm
Ω
Ω
standard unit of electrical resistance; the resistance between two points of a conductor when a constant potential difference of 1.0 volt, applied to these points, produces in the conductor a current of 1.0 ampere
SI derived unit
A/V
siemens
S
unit of electric conductance; the reciprocal of one ohm
SI derived unit
V.s
weber
Wb
unit of magnetic flux (product of the average magnetic field times the perpendicular area that it penetrates), expressed as volt-seconds
SI derived unit
Wb/m^2
tesla
T
unit of flux density, equal to one weber per square meter
SI derived unit
Wb/A
henry
H
unit of inductance; where a circuit's current changes at a constant rate of 1 ampere per second, results in a generation of 1 V of potential difference
SI derived unit
K @ 273.15
degree_Celsius
degrees_Celsius
°C
unit (and scale) of temperature, with same magnitude as the kelvin and a zero-point offset of 273.15
SI derived unit
cd.sr
lumen
lm
unit of luminous flux, a measure of the total "amount" of visible light emitted by a source; one candela-steradian
SI derived unit
lm/m^2
lux
lx
unit of illuminance and luminous emittance, measuring luminous flux per unit area, and used as a measure of intensity of light; equal to one lumen per square meter
SI derived unit
mol/s
katal
kat
unit of catalytic activity (property of a catalyst, such as an enzyme); expresses the ability to break 1 mole of bonds per second under specified conditions
SI derived unit with special names/symbols admitted for reasons of safeguarding human health
1/s
becquerel
Bq
unit of radioactivity; the activity of a quantity of material in which one nucleus decays per second (hence, equivalent to one unit per second)
SI derived unit with special names/symbols admitted for reasons of safeguarding human health
J/kg
gray
Gy
unit of ionizing radiation, a measure of the absorbed dose of radiation; absorption of one joule of radiation energy by one kilogram of matter
SI derived unit with special names/symbols admitted for reasons of safeguarding human health
J/kg
sievert
Sv
unit of ionizing radiation dose, measuring the health effect of low levels of ionizing radiation on the human body