CBSE Class 6 Science – Changes Around Us

Chapter Overview

This chapter explains the concept of changes, their types, and the differences between reversible and irreversible changes.

Important Keywords

• Reversible Change: A change that can be undone (e.g., melting of ice).
• Irreversible Change: A change that cannot be reversed (e.g., burning of paper).
• Physical Change: A change in the appearance or state of a substance without forming a new substance.
• Chemical Change: A change where a new substance is formed with different properties.
• Expansion: Increase in size due to heat.
• Contraction: Decrease in size when cooled.