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Micrometer

A micrometer (µm), also called a micron, is an extremely small unit of length in the metric system. It is equal to one-millionth of a meter (0.000001 meters). Micrometers are used to measure tiny objects that are invisible to the naked eye, such as bacteria, cells, or the thickness of a human hair (which is about 50 to 70 micrometers thick). The symbol for micrometer is "µm". This unit is very important in science, engineering, and manufacturing where precise measurements are needed at microscopic scales. Because it is so small, the micrometer helps scientists study the details of very small structures.

Megameter

A megameter (Mm) is a unit of length in the metric system, equal to 1 million meters (1 Mm = 10⁶ meters or 1,000 kilometers). Megameters are used to measure very large distances, typically on a global or planetary scale. For example, the Earth’s diameter is about 12.7 megameters. Although it’s a valid metric unit, the megameter is rarely used in everyday life or science, as kilometers or other astronomical units are more common for such distances.