What is Metric System explain in brief?

There are two main systems of measurement in use today. Most countries in the world use the Metric System. In only three countries-the U.S., Liberia, and Myanmar (Burma), the primary system is called the English System.

The Metric System

Like the English System, the Metric System is used to measure length, distance, and weight.

Length and distance is usually measured in millimeters, centimeters, meters, and kilometers. The following is a table showing measurements of length and distance:

The meter (m) is the base value.
1 kilometer (km) = 1000 m
1 hectometer (hm) = 100 m
1 decameter (dam) = 10 m
1 meter (m) = 1 m
1 decimeter (dm) = 0.1 m
1 centimeter (cm) = 0.01 m
1 millimeter (mm) = 0.001 m

Weight is measured in milligrams, grams, and kilograms. The following is a table showing different measurements of weight:
The gram (g) is the base value
1 kilogram (kg) = 1000 g
1 gram (g) = 1 g
1 milligram (mg) = 0.001 g