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SI unit

A SI unit is a unit of measurement according to the International System of Units SI. There are seven base units and several derived units. Non-SI units can be converted to SI units (or vice versa) according to the conversion of units.

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Altoona, Pennsylvania

... population density is 1,957.1/km² (5,069.7/mi²). There are 21,681 housing units at an average density of 856.8/km² (2,219.5/mi²). The racial makeup of ...