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Nanometer

A nanometer (nm) is an incredibly small unit of length in the metric system. It equals one-billionth of a meter (0.000000001 meters). Nanometers are used to measure things at the atomic and molecular scale, like the size of viruses, DNA strands, or the width of a few atoms. The symbol for nanometer is "nm". This unit is essential in fields like nanotechnology, physics, and chemistry, where scientists work with materials and particles too tiny to see with regular microscopes. Understanding measurements in nanometers helps researchers develop new materials, medicines, and electronic devices.