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When it comes to understanding the fundamental units of measurement, there are several key concepts that we need to grasp. These units form the foundation of our understanding of the physical world and are crucial in various scientific disciplines. In this article, we will explore the fundamental units of measurement and identify which of the following is not a fundamental unit.
Understanding Fundamental Units
Fundamental units, also known as base units, are the basic building blocks of measurement. They are independent of each other and cannot be derived from any other units. These units are used to measure physical quantities such as length, mass, time, electric current, temperature, amount of substance, and luminous intensity.
There are seven fundamental units in the International System of Units (SI), which is the most widely used system of measurement in the world. These fundamental units are:
 Meter (m) – for length
 Kilogram (kg) – for mass
 Second (s) – for time
 Ampere (A) – for electric current
 Kelvin (K) – for temperature
 Mole (mol) – for amount of substance
 Candela (cd) – for luminous intensity
Identifying the NonFundamental Unit
Now that we have a clear understanding of the fundamental units, let’s examine the options and identify which of the following is not a fundamental unit:
 Newton (N) – for force
 Ohm (Ω) – for electrical resistance
 Pascal (Pa) – for pressure
 Watt (W) – for power
Newton (N) – Force
The Newton (N) is the unit of force in the SI system. It is defined as the force required to accelerate a onekilogram mass by one meter per second squared. The Newton is derived from the fundamental units of kilogram, meter, and second. Therefore, the Newton is a derived unit and not a fundamental unit.
Ohm (Ω) – Electrical Resistance
The Ohm (Ω) is the unit of electrical resistance in the SI system. It is defined as the resistance between two points of a conductor when a constant potential difference of one volt, applied to these points, produces a current of one ampere. The Ohm is derived from the fundamental units of kilogram, meter, and second. Therefore, the Ohm is a derived unit and not a fundamental unit.
Pascal (Pa) – Pressure
The Pascal (Pa) is the unit of pressure in the SI system. It is defined as one newton per square meter. The Pascal is derived from the fundamental units of kilogram, meter, and second. Therefore, the Pascal is a derived unit and not a fundamental unit.
Watt (W) – Power
The Watt (W) is the unit of power in the SI system. It is defined as one joule per second. The Watt is derived from the fundamental units of kilogram, meter, and second. Therefore, the Watt is a derived unit and not a fundamental unit.
Summary
In conclusion, the fundamental units of measurement are the building blocks of our understanding of the physical world. They are independent and cannot be derived from any other units. The fundamental units in the SI system are the meter, kilogram, second, ampere, kelvin, mole, and candela. Among the options provided, the Newton (N), Ohm (Ω), Pascal (Pa), and Watt (W) are all derived units and not fundamental units. Therefore, the answer to the question “Which of the following is not a fundamental unit?” is none of the options provided.
Q&A

 Q: Can derived units be converted into fundamental units?
A: Yes, derived units can be converted into fundamental units by using appropriate conversion factors. For example, the derived unit of force, the Newton (N), can be converted into fundamental units of kilogram, meter, and second.

 Q: Are there any other systems of measurement apart from the SI system?
A: Yes, there are several other systems of measurement, such as the Imperial system and the US customary system. However, the SI system is the most widely used and internationally recognized system of measurement.

 Q: Are there any other derived units apart from the ones mentioned in the article?
A: Yes, there are numerous derived units in the SI system, such as the volt (V) for electric potential, the coulomb (C) for electric charge, and the hertz (Hz) for frequency, among others.

 Q: Can fundamental units be combined to form other fundamental units?
A: No, fundamental units cannot be combined to form other fundamental units. They are independent and serve as the basis for all other units of measurement.

 Q: Why are fundamental units important in scientific research?
A: Fundamental units provide a standardized and consistent way to measure and communicate physical quantities. They are essential in scientific research as they allow for accurate and reproducible measurements, facilitating the exchange of information and collaboration among scientists.