Not very. Half an inch is 0.5 inches. 0.197in is far closer to 1/5 or 0.2 of an inch
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There are eight eighths in one inch. Therefore, in half an inch, there would be four eighths.
Eight half inch cubes would fill a one inch cube.
0.5 is a number not a unit of measurement. However, 0.5 of an inch is the same as half an inch.
One-eighth of an inch.
1/2 inch = 1.27cm