(**M**eter-**K**ilogram-**S**econd system) A metric system of measurement that uses the meter, kilogram, gram and second for length, mass and time. The units of force and energy are the "newton" and "joule."

**Newtons and Joules**

A newton is the force required to accelerate one kilogram by one meter per second squared.

Pronounced "jewel," a joule is equal to 10 million ergs in the CGS (centimeter-gram-second) system. Surge protectors are often given joule ratings, but this refers only to the amount of energy they can absorb, not how much gets through. See SI. Contrast with CGS system.

A newton is the force required to accelerate one kilogram by one meter per second squared.

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