Biological Structures:
• Virus: 20-400 nm (0.02-0.4 μm)
• Bacteria: 1-5 μm (1,000-5,000 nm)
• Cell organelles: 0.1-10 μm
• Human hair: 17-180 μm (17,000-180,000 nm)
Technology & Materials:
• DNA helix: 2.5 nm (0.0025 μm)
• Semiconductor node: 3-7 nm
• Carbon nanotube: 1-2 nm diameter
• Microprocessor features: 5-14 nm
Particles & Wavelengths:
• Visible light: 380-700 nm
• X-ray: 0.01-10 nm
• Atmospheric particles: 0.1-10 μm
• Pollen grains: 10-200 μm