+The **kilogram** (kg) is the base unit of [mass](/wiki/mass) within the International System of Units (SI). Once defined by a physical prototype, it is now fixed by fundamental constants, providing a precise, universal measure of a body's [inertia](/wiki/inertia).
+## See also
+- [Mass](/wiki/mass)
+- [SI Unit](/wiki/si-unit)
+- [Gram](/wiki/gram)
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