Wikipedia: 1e-7 m

• Distances shorter than 100 nm
• 100 nm -- 1000 angstrom
• 100 nm -- side of square of area [10^-14 m²]?
• 100 nm -- Maximum particle size that can fit through a surgical mask
• 120 nm -- Maximum particle size that can fit through a ULPA filter[1]
• 280 nm -- near ultraviolet wavelength
• 300 nm -- Maximum particle size that can fit through a HEPA filter
• 380-430 nm -- wavelength of violet? light -- see color
• 430-450 nm -- wavelength of indigo light
• 450-500 nm -- wavelength of blue light
• 500-520 nm -- wavelength of cyan light
• 520-565 nm -- wavelength of green light
• 565-590 nm -- wavelength of yellow light
• 590-625 nm -- wavelength of orange light
• 625-740 nm -- wavelength red light
• Distances longer than 1.0 micrometre