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What Are Physical Quantities in Physics?

 Introduction

In physics, we describe the world using physical quantities—measurable properties like length, mass, time, and temperature. These quantities form the language of physics.

What Are Physical Quantities?
A physical quantity is any property of a material or system that can be measured or calculated. For example:

  • Length (meter)

  • Mass (kilogram)

  • Time (second)

  • Temperature (kelvin)

Types of Physical Quantities

  1. Base Quantities
    These are fundamental and independent. There are seven:

  • Length (m)

  • Mass (kg)

  • Time (s)

  • Temperature (K)

  • Electric current (A)

  • Amount of substance (mol)

  • Luminous intensity (cd)

  1. Derived Quantities
    These are formed by combining base quantities using mathematical operations. Examples:

  • Speed = distance/time (m/s)

  • Force = mass × acceleration (N)

Scalar and Vector Quantities

  • Scalars: Have magnitude only (e.g., speed, mass).

  • Vectors: Have magnitude and direction (e.g., velocity, force).

Conclusion
Physical quantities help us quantify the world and express the laws of physics precisely. Without them, science would be purely theoretical and hard to apply.

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