7 SI Base Units
| Base Quantity | Unit | Symbol |
| Time | Second | s |
| Length | Meter | m |
| Mass | Kilogram | kg |
| Electric Current | Ampere | A |
| Temperature | Kelvin | K |
| Amount of Substance | Mole | mol |
| Candela | Luminous Intensity | cd |
Important SI Derived Units
| Quantity | Unit | Symbol |
| Area | Square Meter | m2 |
| Volume | Cubic Meter | m3 |
| Speed or Velocity | Meter Per Second | m/s |
| Acceleration | Meter Per Second Square | m/s2 |
| Angular Velocity | Radian Per Second | rad/s |
| Frequency | Hertz | Hz |
| Force | Newton | N |
| Pressure | Pascal | Pa |
| Work or Energy | Joule or Newton meter | J or Nm |
| Power | Watt | W |
| Electric Charge | Coulomb | C |
| Potential Difference Electromotive Force(emf) | Volt | V |
| Electric Field Strength | Volt Per Meter | V/m |
| Electric Resistance | Ohm or Volt/Ampere | Ω or V/A |
| Capacitance | Farad | F |
| Magnetic Flux | Weber | Wb |
| Inductance | Henry | H |
| Magnetic Flux Density | Tesla | T |
| Magnetic Field Strength | Ampere Per Meter | A/m |
| Entropy | Joule Per Kelvin | J/K |
| Specific Heat | Joule Per Kilogram Kelvin | J/(Kg. K) |
| Thermal Conductivity | Watt Per Meter Kelvin | W/(m.K) |
| Plane Angle | Radian | rad |
| Solid Angle | Steradian | sr |
Unit Prefix in the Metric System
| Prefix | Multiplier |
| tera | 1012 |
| giga | 109 |
| mega | 106 |
| kilo | 103 |
| hecto | 102 |
| deca | 10 |
| deci | 10-1 |
| centi | 10-2 |
| mili | 10-3 |
| micro | 10-6 |
| nano | 10-9 |
| pico | 10-12 |
