# International System of Units and Standard Units

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THE IMPORTANCE OF STANDARD UNITS
The system of measurements is very important in everyday life . In the past , various systems of measurements were used. For example , length was measured in units like foot , yard , chain and mile . Weight was measured in units like pound , ounce , kati , tahil . Today , many countries in the world use the same units of measurements . We say that they use standard units . The standard units used are the S.I. units . Under this system of units , mass is measured in kilograms (kg) and length is measured in metres (m). The use of standard units makes it easier for people from different countries to communicate with each other . Furthermore , the use of a standard units means a measurement in that unit has the same value anywhere in the world .
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THE PROBLEMS THAT MAY ARISE IF THERE ARE NO STANDARD UNITS
If standard units of measurements are not used people might become confused. For example, if I ask you to weigh an ounce of something, do I mean a fluid ounce, or an actual ounce in weight or maybe even a troy ounce? Using a standard means such confusion won't happen.

An example of something that went wrong:
A very expensive robot was trashed because it crashed on Mars. One NASA scientist had used Imperial measurements, while the rest of the team used the metric system (which is standard in science). The result? Millions of wasted dollars and a lot of disappointed people. The SI units are rationally defined, universal, based on a decimal system.
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SPECIAL FEATURES OF SI UNITS
The SI units are rationally defined, universal, based on a decimal system.
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