Tuesday, July 3, 2007

THE S.I. DERIVED UNITS

SI DERIVED UNITS

Frequency
hertz: Hz = 1/s


Force
newton: N = m kg/s2


Pressure, stress
pascal: Pa = N/m2 = kg/m s2


Energy, work, quantity of heat
joule: J = N m = m2 kg/s2


Power, radiant flux
watt: W = J/s = m2 kg/s3


Quantity of electricity, electric charge
coulomb: C = s A


Electric potential
volt: V = W/A = m2 kg/s3 A


Capacitance
farad: F = C/V = s4 A2/m2 kg


Electric resistance
ohm: Omega = V/A = m2 kg/s3 A2


Conductance
siemens: S = A/V = s3 A2/m2 kg


Magnetic flux
weber: Wb = V s = m2 kg/s2 A


Magnetic flux density, magnetic induction
tesla: T = Wb/m2 = kg/s2 A


Inductance
henry: H = Wb/A = m2 kg/s2 A2


Luminous flux
lumen: lm = cd sr


Illuminance
lux: lx = lm/m2 = cd sr/m2


Activity (ionizing radiations)
becquerel: Bq = 1/s


Absorbed dose
gray: Gy = J/kg = m2/s2


Dynamic viscosity
pascal second: Pa s = kg/m s


Moment of force
metre newton: N m = m2 kg/s2


Surface tension
newton per metre: N/m = kg/s2


Heat flux density, irradiance
watt per square metre: W/m2 = kg/s3


Heat capacity, entropy
joule per kelvin: J/K = m2 kg/s2 K


Specific heat capacity, specific entropy
joule per kilogram kelvin: J/kg K = m2/s2 K


Specific energy
joule per kilogram: J/kg = m2/s2


Thermal conductivity
watt per metre kelvin: W/m K = m kg/s3 K


Energy density
joule per cubic metre: J/m3 = kg/m s2


Electric field strength
volt per metre: V/m = m kg/s3 A


Electric charge density
coulomb per cubic metre: C/m3 = s A/m3


Electric displacement, electric flux density
coulomb per square metre: C/m2 = s A/m2


Permittivity
farad per metre: F/m = s4 A2/m3 kg


Permeability
henry per metre: H/m = m kg/s2 A2


Molar energy
joule per mole: J/mol = m2 kg/s2 mol


Molar entropy, molar heat capacity
joule per mole kelvin: J/mol K = m2 kg/s2 K mol


Exposure (ionizing radiations)
coulomb per kilogram: C/kg = s A/kg


Absorbed dose rate
gray per second: Gy/s = m2/s3