In order to apply measurements from the SI system to the English system, it is necessary to develop relationships of known equivalents (conversion factors). These equivalents can then be used to convert from the given units of measure to the desired units of measure.

EO 1.4CONVERT between English and SI units of length.

EO 1.5CONVERT between English and SI units of mass.

EO 1.6CONVERT time measurements between the following:

a. Years

b. Weeks

c. Days

d. Hours

e. Minutes

f. Seconds

Personnel at DOE nuclear facilties are often exposed to both the English and SI systems of units in their work. In some cases, the measurements that are taken or read from an instrument will be different from those required by a procedure. This situation will require the conversion of measurements to those required by the procedure.

Conversion Factors

Conversion factors are based on relationships of equivalents from different measurement systems. These conversion factors are then applied to the given measurement in order to convert it to the units that are required. The equivalent relationships between different units of measurement are defined in conversion tables. Some examples from conversion tables are given below.

A typical conversion table is shown in Table 7.