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 Non-Fundamental 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:

  1. Newton (N) – for force
  2. Watt (W) – for power
  3. Pascal (Pa) – for pressure
  4. Ohm (Ω) – for electrical resistance

Newton (N) – The Unit of Force

The Newton (N) is the unit of force in the SI system. It is named after Sir Isaac Newton, the renowned physicist who formulated the laws of motion. The Newton is defined as the force required to accelerate a one-kilogram mass by one meter per second squared.

For example, when you push a book on a table, you are applying a force to overcome the friction between the book and the table. This force can be measured in Newtons.

Watt (W) – The Unit of Power

The Watt (W) is the unit of power in the SI system. It is named after James Watt, the Scottish engineer who made significant contributions to the development of the steam engine. The Watt is defined as one joule of energy per second.

Power is the rate at which work is done or energy is transferred. For example, the power of a light bulb indicates how much energy it consumes per unit time. The higher the wattage, the brighter the light.

Pascal (Pa) – The Unit of Pressure

The Pascal (Pa) is the unit of pressure in the SI system. It is named after Blaise Pascal, the French mathematician, physicist, and philosopher. The Pascal is defined as one newton of force per square meter of area.

Pressure is defined as the force applied perpendicular to the surface of an object per unit area. For example, the pressure exerted by a gas in a container can be measured in Pascals.

Ohm (Ω) – The Unit of Electrical Resistance

The Ohm (Ω) is the unit of electrical resistance in the SI system. It is named after Georg Simon Ohm, the German physicist who formulated Ohm’s law. The Ohm is defined as the resistance that allows one ampere of current to flow when one volt of potential difference is applied.

Resistance is a measure of how much a material or device opposes the flow of electric current. For example, the resistance of a wire determines how much current can flow through it when a voltage is applied.


In conclusion, the non-fundamental unit among the options provided is the Pascal (Pa), which is the unit of pressure. The fundamental units of measurement are the meter (m), kilogram (kg), second (s), ampere (A), kelvin (K), mole (mol), and candela (cd). Understanding these fundamental units is essential for accurate and consistent measurement in various scientific fields.


    1. Q: Why are fundamental units important?

A: Fundamental units are important because they provide a standardized and consistent way to measure physical quantities. They form the basis for all other units of measurement and allow scientists and researchers to communicate and compare their findings accurately.

    1. Q: Can fundamental units change over time?

A: The fundamental units are based on natural constants and are considered to be universal and unchanging. However, advancements in scientific knowledge and technology may lead to redefinitions of these units to increase precision and accuracy.

    1. Q: Are there any other non-fundamental units?

A: Yes, there are many non-fundamental 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. These units are derived from the fundamental units and are used to measure more specific quantities.

    1. Q: Are there different systems of fundamental units?

A: Yes, there are different systems of fundamental units used in different parts of the world. However, the SI system is the most widely adopted and internationally recognized system of measurement.

    1. Q: Can fundamental units be combined?

A: Yes, fundamental units can be combined to derive units for other physical quantities. For example, the unit for speed is meters per second (m/s), which combines the fundamental units of length and time.


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