Units Basic units of the SI Magnitude Name Symbol Length meter m Mass kilogram kg Time second s Electric current amper A Thermodynamic temperature kelvin K Quantity of substance mol mol Luminous intensity candela cd Units derived from SI Magnitude Name Symbol Plane angle radian rad Solid angle steradian sr Frequency hertz Hz Force newton N Pressure, strain pascal Pa Pressure, strain atmosphere atm Energy, work, quantity of heat joule J Energy electronvolt eV Power, radiant flux watt W Electric potential difference, electromotive force volt V Capacitance farad F Electrical resistance ohm Electrical charge coulomb C Electrical conductivity siemens S Magnetic flux weber Wb Magnetic flux density tesla T Inductance henry H Luminous flux lumen lm Illuminance lux lx Radioactivity becquerel Bq Absorbed dose gray Gy Equivalent dose sievert Sv Catalytic activity katal Kat Molar concentration molar M Unit of mass dalton u Units from other systems Magnitude Name Symbol Time hour h Time minute min Volume liter l Pressure, strain bar b Force kilopond kp Length yard yd Length foot ft Length inch in Length mile mi Length nautical mile nmi Volume gallon gal Mass ounce oz Mass pound lb Volume fluid ounce floz Volume pint pt Table of Contents Basic units of the SI Units derived from SI Units from other systems