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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.

Inch

An inch is a unit of length used primarily in the imperial and U.S. customary systems. It is commonly used in countries like the United States, Canada, and the UK for measuring shorter lengths. One inch equals 2.54 centimeters. There are 12 inches in a foot. Inches are often used to measure things like screen sizes, paper dimensions, or body measurements. For example, a standard smartphone screen might be about 6 inches. The symbol for inch is "in" or a double quote mark (″). Rulers, measuring tapes, and toolkits often include inches for easy reference. Although the metric system is more widely used globally, inches remain common in certain industries and countries for specific applications.