UNITS & DIMENSIONS---What are Physical Quantities?
Introduction: Why Physical Quantities Matter? Imagine you're an engineer designing a rocket or a doctor calculating the dosage of a life-saving drug. How do you ensure precision? The answer lies in physical quantities —the measurable properties that define the universe. For NEET, JEE Mains, and JEE Advanced aspirants, mastering these is crucial because every equation, every experiment, and every discovery in physics relies on them! A physical quantity is any measurable property of a physical system, expressed as a numerical value and a unit. All the quantities which are used to describe the laws of physics are known as physical quantities. Example: Mass of an electron = 9.11 × 10⁻³¹ kg Speed of light = 3 × 10⁸ m/s Key Features: Measurable (can be quantified using instruments). Has a unit (like meters, seconds, kilograms). Can be scalar (magnitude only) or vector (magnitude + direction). In physics, Physical Quantities are those p...