SI Units and Their Symbols

luminous flux

• lm (lumen)

• cd (candela)

• lx (lux)

• lm/m² (lumen per square meter)

solid angle

• rad (radian)

• sr (steradian)

• deg (degree)

• mrad (milliradian)

energy, work, amount of heat

• J (joule)

• N (newton)

• W (watt)

• C (coulomb)

capacitance

• A (ampere)

• F (farad)

• V (volt)

• Ω (ohm)

Celsius temperature

• °C (degree Celsius)

• °F (degree Fahrenheit)

• K (Kelvin)

• °R (Rankine)

activity referred to a radionuclide

• Bq (becquerel)

• Gy (gray)

• Sv (sievert)

• Ci (curie)

frequency

• kHz (kilohertz)

• Hz (hertz)

• MHz (megahertz)

• GHz (gigahertz)

plane angle

• deg (degree)

• rad (radian)

• grad (gradian)

• sec (second)

power, radiant flux

• V (volt)

• A (ampere)

• W (watt)

• J (joule)

dose equivalent, ambient dose equivalent, directional dose equivalent, personal dose equivalent

• Gy (gray)

• Sv (sievert)

• Rad (radiation absorbed dose)

• Rem (roentgen equivalent man)