Kilometre

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The kilometre (SI symbol: km; or ), spelt kilometer in American English, is a unit of length in the International System of Units (SI), equal to one thousand metres (kilo- being the SI prefix for 1000). It is the preferred measurement unit to express distances between geographical places on land in most of the world; notable exceptions are the United States, the United Kingdom, and Liberia where the statute mile is used.

Read on Wikipedia · Image Pedro Ribeiro Simões from Lisboa, Portugal, CC BY 2.0