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MKS: another name for SI (Système International), the metric system of units. MKS stands for Meters-Kilograms-Seconds. The term "MKS" is often used to distinguish from "CGS" (Centimeters-Grams-Seconds), another metric system.

Most physicists use MKS, while some physicists, most astrophysicists, and chemists use CGS (although these fields also tend to use whatever unit makes the number a nice couple-digit-number).

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