The Metric SystemThe Metric system is used universally throughout the science world. The word "metric" stems from the base unit of a meter.
Some of the base units of the metric system are: Base unit for measuring length is the meter (m) Base unit for measuring volume is the liter (L) Base unit for measuring mass is the kilogram (kg) When measuring temperature, scientists use the metric unit of Celcius. A few common metric prefixes are: Centi (c) = 1/100 of the base unit Makes base unit smaller Centimeter Milli (m) = 1/1000 of the base unit Makes base unit smaller Millimeter Kilo (k) = 1000 times the base unit Makes base unit larger Kilogram 

Measurement Tools
A meter stick is used to measure length. There are 100 centimeters in 1 meter, and 10 millimeters in 1 centimeter.