## Dimensions of Physical Quantities – Class 11 | Chapter – 2 | Physics Short Notes Series PDF for NEET & JEE

Dimensions of Physical Quantities: Physical quantities are properties of matter or energy that can be measured or quantified using a scientific instrument or a mathematical formula. Some examples of physical quantities include length, mass, time, temperature, electric charge, velocity, acceleration, force, energy, and power.

These physical quantities can be either scalar or vector quantities. Scalar quantities have only magnitude and no direction, such as mass or temperature. Vector quantities have both magnitude and direction, such as velocity or force.

Physical quantities can be further categorized as fundamental or derived quantities. Fundamental quantities are independent and cannot be defined in terms of other physical quantities. The seven fundamental physical quantities are length, mass, time, electric current, temperature, amount of substance, and luminous intensity. Derived physical quantities are obtained by combining two or more fundamental physical quantities using mathematical operations. Examples of derived physical quantities include speed, acceleration, force, and energy.

## Dimensions of Physical Quantities

Physical quantities have different dimensions depending on the type of quantity being measured. The most commonly used dimensions of physical quantities include:

• Length: Length is measured in meters (m) and is used to describe the size of an object or distance between two points.
• Mass: Mass is measured in kilograms (kg) and is used to describe the amount of matter in an object.
• Time: Time is measured in seconds (s) and is used to describe the duration of an event.
• Electric current: Electric current is measured in amperes (A) and is used to describe the flow of electric charge.
• Temperature: Temperature is measured in kelvin (K) and is used to describe the degree of hotness or coldness of an object.
• Amount of substance: Amount of substance is measured in moles (mol) and is used to describe the number of particles (such as atoms, molecules, or ions) in a substance.
• Luminous intensity: Luminous intensity is measured in candelas (cd) and is used to describe the brightness of light.

These dimensions of physical quantities can be combined in different ways to create other physical quantities, such as speed (length/time), acceleration (length/time2), force (mass x acceleration), and energy (mass x length2/time2). It is important to use the correct units and dimensions when making measurements and performing calculations in physics and other sciences.

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