# Measurement

Measurement is the determination of quantitative attributes, such as Length, Volume, Weight, Time,  Mass, Temperature, …

Usually, the number obtained in a measure is in reference to some standard such as a meter or a yard. ### ME21 Time

The metric system is the system of measurement used in most countries. The metric system is simple and coherent. It uses a single basic unit for each quantity measured. The basic unit of length is the meter, the basic unit of mass is the gram, and the basic unit of volume is the liter.

The metric system is a base-ten system, it uses prefixes to scale a basic unit like  Deka, Hecto, and Kilo meaning, respectively, 10, 100, and 1000; and decicenti, and milli, meaning,  one-tenth, one-hundredth, and one-thousandth respectively.

### ME01     Metric (converting units of measure)

The US customary systems of measurement can be traced back to the Roman Measurement system. It is a system of arbitrary measuring units.

### ME02     Customary (converting units of measure) Customary Units of measure_(Help)