78 SecTion | 3 Fundamentals and Units of Measurement Table 3.1 Multiple and Submultiple Prefixes--Contd. Name of Number Number Millionth Billionth Trillionth Quadrillionth 0.000 001 0.000 000 001 0.000 000 000 001 Exponential Symbol Prefix Form 1.0 × 10 ­6 1.0 × 10 ­9 1.0 × 10 ­12 µ n p f Micro- Nano- Pico- Femto- 0.000 000 000 000 001 1.0 × 10 ­15 3.1.2 Fundamental Quantities There are seven fundamental quantities in physics: length, mass, time, intensity of electric current, temperature, luminous intensity, and molecular substance. Two supplementary quantities are plane angle and solid angle. 3.1.3 derived Quantities Derived quantities are those defined in terms of the seven fun- damental quantities, for instance, speed = length/time. There are sixteen derived quantities with names of their own: energy (work, quantity of heat), force, pressure, power, electric charge, electric potential difference (voltage), electric resistance, electric conduc- tance, electric capacitance, electric inductance, frequency, mag- netic flux, magnetic flux density, luminous flux, illuminance, and customary temperature. Following are thirteen additional derived quantities that carry the units of the original units that are com- bined. They are area, volume, density, velocity, acceleration, angu- lar velocity, angular acceleration, kinematic viscosity, dynamic viscosity, electric field strength, magnetomotive force, magnetic field strength, and luminance. 3.1.4 definition of the Quantities The quantities will be defined in SI units, and their U.S. customary unit equivalent values will also be given.