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48 Part I: Technical Mathematics
Part I.E
Similarly, to convert square millimeters into square inches we use the reverse
operation; that is, we divide the square millimeters by a factor of 645.2. Thus,
1290.4 square millimeters = 1290.4 ÷ 645.2 = 2 square inches.
To convert volume units between the English and metric or SI systems, use the relationships
given in Table 5.14. For example, to convert cubic inches into cubic centimeters,
the table shows that we multiply the number of cubic inches by a factor of
16.38716. Thus, for instance, to convert two cubic inches into cubic centimeters:
2 cubic inches = 2 × 16.38716 = 32.77432 cubic centimeters
Similarly, to convert cubic centimeters into cubic inches we use the reverse operation;
that is, we divide the cubic inches by a factor of 16.38716. Thus,
32.77432 cubic centimeters = 32.77432 ÷ 16.38716 = 2 cubic inches.
To convert weight and mass units between the English and metric or SI systems,
use the relationships given in Table 5.15. For example, to convert pounds into
grams, the table shows that we multiply the number of pounds by a factor of 453.6.
Thus, for instance, to convert two pounds into grams:
2 pounds = 2 × 453.6 = 907.2 grams
Table 5.14 Converting measures of volume—English and metric units.
From To Multiply by Divide by
Cubic inches Cubic centimeters 16.38716
Cubic centimeters Cubic inches 16.38716
Cubic feet Cubic meters 0.02832
Cubic meters Cubic feet 0.02832
Cubic yards Cubic meters 0.7645
Cubic meters Cubic yards 0.7645
Table 5.15 Converting measures of weight and mass.
From To Multiply by Divide by
Pounds Grams 453.6
Grams Pounds 453.6
Pounds Kilograms 0.4536
Kilograms Pounds 0.4536
Tons Kilograms 907.2
Kilograms Tons 907.2