One quarter of an inch (0.25 in) is about the width of a #2 pencil (0.635 cm).
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Much closer to 10 inches
For a quarter inch, it .25''
1 micron = .00003937 inch (approx), so 25 microns = .00098425 inch (approx). .001 inch (one one-thousanth of an inch, or one mil) = 25.4 microns (approx).
.25
Twenty-five thousandths of an inch.