A system of measuring based on:

· The meter for length

· The kilogram for mass

· The second for time

Examples:

A kilometer is 1,000 meters

A centimeter is 1/100th (one-hundredth) of a meter

A cubic meter is the volume of a cube whose sides are 1 meter long

A liter is 1/1,000th (one-thousandth) of a cubic meter

A tonne is 1,000 kilograms