Decimal number system
Standard units are used for measurmen as there is a system called the SI units and that is considered as the international system of units that is why we use standard units for measurment .
Metric
units is not a specific amount or measurment, it is simply a word that can take place of any measurment. (eg. cm, m, km, miles, etc.)
scientific notation
Scientists generally use the International System of Units (SI) as their standard for measurement. This system includes units such as meters for length, kilograms for mass, and seconds for time. However, in specialized fields or historical contexts, different units of measurement may be used.
The basic standard units are:kilogram (mass)meter (distance)second (time)ampere (electric current)kelvin temperature)mole (amount of chemical substance)candela (luminous intensity).
measurment
2.999239468 or about 3 units of measurment
Volume is measured in cubic units
Perimeter = 4*13 = 52 units of measurment
the international system of units is based on units of 10 and has 3 main standards, the meter, liter, and gram.
si units are based on the metric system system international (French) international system (English)