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Kilometer

A kilometer (km) is a unit of length in the metric system, used to measure long distances. One kilometer equals 1,000 meters or about 0.62 miles. Kilometers are commonly used to measure distances between cities, in road signs, and in running or walking events. For example, a marathon is 42.195 kilometers long. The symbol for kilometer is "km". Most countries around the world use kilometers instead of miles for speed and distance, especially in transportation. Because it covers a large distance, the kilometer is not used for measuring small objects but is perfect for travel and mapping.

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.