How many base units are used to measure the physical quantities, according to SI units system?
7
The International System of Units (SI) is the modern form of the metric system. It is the world's most widely used system of measurement. A crucial aspect of the SI system is its foundation on a set of base units. These base units are independent and form the basis for deriving all other units.
There are seven base units in the SI system, each representing a fundamental physical quantity:
- meter (m): length
- kilogram (kg): mass
- second (s): time
- ampere (A): electric current
- kelvin (K): thermodynamic temperature
- mole (mol): amount of substance
- candela (cd): luminous intensity
All other units in the SI system are derived from these seven base units. For example, the unit of speed, meters per second (m/s), is derived from the base units of length (meter) and time (second).
Therefore, the correct answer is 7.
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