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