NCERT Question 1.14 | Chapter 1 Class 11 Chemistry | SI Unit of Mass and Its Definition

This video explains NCERT Question 1.14 from Chapter 1, "Some Basic Concepts of Chemistry," for Class 11.

Question:
What is the SI unit of mass? How is it defined?

The explanation covers both the basic answer and the modern scientific definition, including:
• SI unit of mass (kilogram, kg)
• Concept of base units in the SI system
• Modern definition of kilogram using Planck’s constant
• Understanding of units involved (J, kg, m, s)
• Difference between old definition (physical object) and modern definition (constant of nature)
• Importance of using fundamental constants for accurate measurement

Key Concept:
The kilogram is defined by fixing the numerical value of Planck’s constant (h), ensuring a precise and universal standard of mass.

Final Answer:
SI unit of mass = kilogram (kg)
Kilogram is defined using Planck’s constant (h), along with already defined units of meter (m) and second (s).

Chapter: 1 – Some Basic Concepts of Chemistry
Class: 11
Topic: SI Units and Modern Definitions

This explanation follows NCERT methodology and is intended for academic understanding and examination preparation.

For more such concept-based explanations, refer to Anju Smart Classes.

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