SI Derived Unit Units
The 22 coherent SI derived units with special names, from the hertz to the katal, each a product of powers of the base units. 22 units are listed.
| Unit | Symbol | Quantity | Value in SI |
|---|---|---|---|
| Hertz | Hz | Frequency | 1 Hz = 1 s⁻¹ |
| Radian | rad | Plane angle | 1 rad = 1 m/m (dimensionless); 180°/π |
| Steradian | sr | Solid angle | 1 sr = 1 m²/m² (dimensionless) |
| Newton | N | Force | 1 N = 1 kg·m·s⁻² |
| Pascal | Pa | Pressure | 1 Pa = 1 N/m² = 1 kg·m⁻¹·s⁻² |
| Joule | J | Energy | 1 J = 1 N·m = 1 kg·m²·s⁻² |
| Watt | W | Power | 1 W = 1 J/s = 1 kg·m²·s⁻³ |
| Coulomb | C | Electric charge | 1 C = 1 A·s |
| Volt | V | Electric potential | 1 V = 1 W/A = 1 kg·m²·s⁻³·A⁻¹ |
| Ohm | Ω | Electrical resistance | 1 Ω = 1 V/A = 1 kg·m²·s⁻³·A⁻² |
| Siemens | S | Electrical conductance | 1 S = 1 Ω⁻¹ = 1 kg⁻¹·m⁻²·s³·A² |
| Farad | F | Capacitance | 1 F = 1 C/V = 1 kg⁻¹·m⁻²·s⁴·A² |
| Henry | H | Inductance | 1 H = 1 Wb/A = 1 kg·m²·s⁻²·A⁻² |
| Tesla | T | Magnetic flux density | 1 T = 1 Wb/m² = 1 kg·s⁻²·A⁻¹ |
| Weber | Wb | Magnetic flux | 1 Wb = 1 V·s = 1 kg·m²·s⁻²·A⁻¹ |
| Degree Celsius | °C | Temperature | t/°C = T/K − 273.15 |
| Lumen | lm | Luminous flux | 1 lm = 1 cd·sr |
| Lux | lx | Illuminance | 1 lx = 1 lm/m² |
| Becquerel | Bq | Radioactivity | 1 Bq = 1 s⁻¹ (one decay per second) |
| Gray | Gy | Absorbed dose | 1 Gy = 1 J/kg = 1 m²·s⁻² |
| Sievert | Sv | Equivalent dose | 1 Sv = 1 J/kg = 1 m²·s⁻² |
| Katal | kat | Catalytic activity | 1 kat = 1 mol/s |