3.10 Common Conversion Factors 127 reproduce. Often the reproducer actually reproduces the second harmonic of the frequency, and the brain translates it back to the fundamental. 3.10 coMMon conVeRSion FAcToRS Conversion from U.S. to SI units can be made by multiplying the U.S. unit by the conversion factors in Table 3.8. To convert from SI units to U.S. units, divide by the conversion factor. Table 3.8 U.S. to SI Units Conversion Factors U.S. Unit length ft Multiplier 3.048 000 × 10 ­1 3 SI Unit m