MIL-HDBK-1908 Definitions of Human Factors TermsThis handbook defines terms frequently used in human factors standardization documents by providing common meanings of such terms to ensure that they will be interpreted consistently and in the manner intended.

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TO CONVERT FROM                     TO                           MULTIPLY BY

*I

ANGLE        degree (deg)                          radian (rad)                  0.017 453 29 minute (min)                         radian (rad)                  0.000 290 888 second (sec)                          radian (rad)                  0.000 004 848 radian (rad)                           degree (deg)                 57.295 8 radian (rad)                           minute (min)                 3437.75 radian (rad)                           second (sec)                 206264.0

LENGTH-AREA-VOLUME  foot (ft)                                 meter (m)                     *0.304 8

foot2 (ft2)                             meter2 (m2)                 *0.092 903 04 foot3 (ft3)                             meter3 (m3)                   0.028 316 85

inch (in)                                meter (m)                      *0.025 4 inch (in)                                millimeter (mm)            *25.4

inch2 (in2)                            millimeter (mm2)         *645.16

inch2 (in2)                            meter2 (m2)                *0.000 645 16 inch3 (in3)                            meter3 (m3)                        0.000 016 387 meter (m)                              foot (ft)                       3.280 84

meter2 (m2)                          foot2 (ft2)                     10.763 9

meter3 (m3)                          foot3 (ft3)                     35.314 7

meter (m)                              inch (in)                       39.370 1 meter2 (m2)                          inch2 (in2)                         1550.00 meter3 (m3)                          inch3 (in3)                           61023.8

millimeter (mm)                   inch (in)                              0.039 37 millimeter2 (mm2)               inch2 (in2)                          0.001 55

LIGHT        footcandle (ft-C)                   lux (lx)                              10.763 91 footlambert (ft-L)                 candela/meter2 (cd/m2)      3.426 259

lux (lx)                                  footcandle (ft-C)                 0.092 903 candela/meter2 (cd/m2)        footlambert (ft-L)               0.291 864

WEIGHT, FORCE,                 ounce (ozf)                            newton (N)                          0.278 013 9

TORQUE, PRESSURE           ounce-inch (ozf-in)               newton meter (N-m)           0.007 061 55 pound (lb avoirdupois)         kilogram (kg)                    *0.453 592 37 pound-force (lbf)                  newton (N)                          4.448 222 pound-inch (lbf-in)               newton meter (N-m)           0.112 984 8 pound/square inch (psi)        pascal (Pa)                           6894.757 newton (N)                            ounce-force (ozf                 3.596 94 newton meter (N-m)             ounce-inch (ozf-in)            141.611 kilogram (kg)                        pound (lb)                           2.204 62 newton (N)                            pound-force (lbf)                0.224 809 newton-Meter (N-m)            pound-inch (lbf-in)             8.850 75 pascal (Pa)                            pound/square inch (psi)     133.322

PREFIXES

Nano(n)   10-9            Centi(c)   10-2

Micro(µ)  10-6            Kilo(k)     103

Milli(m)   10-3            Mega(M) 106

ndicates exact conversion

TEMPERATURE CONVERSION

oC = 5/9 (oF - 32)

oF = 9/5 oC + 32