At 100.0 µm this is in the range of a human hair (17-180 µm) or a grain of fine sand (~500 µm).
In everyday units: 0.1000 mm or 0.003937 inches.
Micrometers are the standard unit for surface roughness (Ra values), optical wavelengths, and precision machining tolerances in manufacturing.
Next stepFor wavelengths of visible light (0.38-0.70 µm), infrared (0.7-1000 µm), or for specifying machining tolerances, use the micrometer values in the table above.