Page 36 - Aeronautical Engineer Data Book

Fundamental dimensions and units 23
Table 2.11 Imperial-metric conversions
Fraction Decimal Millimetre Fraction Decimal Millimetre
(in) (in) (mm) (in) (in) (mm)
1/64 0.01562 0.39687 33/64 0.51562 13.09687
1/32 0.03125 0.79375 17/32 0.53125 13.49375
3/64 0.04687 1.19062 35/64 0.54687 13.89062
1/16 0.06250 1.58750 9/16 0.56250 14.28750
5/64 0.07812 1.98437 37/64 0.57812 14.68437
3/32 0.09375 2.38125 19/32 0.59375 15.08125
7/64 0.10937 2.77812 39/64 0.60937 15.47812
1/8 0.12500 3.17500 5/8 0.62500 15.87500
9/64 0.14062 3.57187 41/64 0.64062 16.27187
5/32 0.15625 3.96875 21/32 0.65625 16.66875
11/64 0.17187 4.36562 43/64 0.67187 17.06562
3/16 0.18750 4.76250 11/16 0.68750 17.46250
13/64 0.20312 5.15937 45/64 0.70312 17.85937
7/32 0.21875 5.55625 23/32 0.71875 18.25625
15/64 0.23437 5.95312 47/64 0.73437 18.65312
1/4 0.25000 6.35000 3/4 0.75000 19.05000
17/64 0.26562 6.74687 49/64 0.76562 19.44687
9/32 0.28125 7.14375 25/32 0.78125 19.84375
19/64 0.29687 5.54062 51/64 0.79687 20.24062
15/16 0.31250 7.93750 13/16 0.81250 20.63750
21/64 0.32812 8.33437 53/64 0.82812 21.03437
11/32 0.34375 8.73125 27/32 0.84375 21.43125
23/64 0.35937 9.12812 55/64 0.85937 21.82812
3/8 0.37500 9.52500 7/8 0.87500 22.22500
25/64 0.39062 9.92187 57/64 0.89062 22.62187
13/32 0.40625 10.31875 29/32 0.90625 23.01875
27/64 0.42187 10.71562 59/64 0.92187 23.41562
7/16 0.43750 11.11250 15/16 0.93750 23.81250
29/64 0.45312 11.50937 61/64 0.95312 24.20937
15/32 0.46875 11.90625 31/12 0.96875 24.60625
31/64 0.48437 12.30312 63/64 0.98437 25.00312
1/2 0.50000 12.70000 1 1.00000 25.40000

M Mass
L Length
T Time
For example, velocity (v) is represented by
length divided by time, and this is shown by:
L
[v] = 3 : note the square brackets denoting
T
‘the dimension of’.
Table 2.12 shows the most commonly used
quantities.