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
scientific notation
metric measurement is the system based on multiplies of 10. ie. there are 10 millimetres in a centimetre, 100 centimetres in a meter, 1000 metres in a kilometre. Similarly for other measurements such as the Litre, or the kilogram.
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.)
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
the international system of units is based on units of 10 and has 3 main standards, the meter, liter, and gram.
The world system of measurements units is based on the metric system (SI).
si units are based on the metric system system international (French) international system (English)