Expansion is the increase in the size or volume of a substance due to heating. It occurs because particles move faster and spread apart when heated. Expansion can be linear areal or volumetric depending on the dimension considered and is commonly observed in solids liquids and gases with varying magnitudes.
Class 11 Physics Chapter 10 Thermal Properties of Matter explains the behavior of matter under temperature changes. It covers concepts like heat transfer expansion of solids liquids and gases specific heat capacity thermal conductivity and temperature scales. Understanding these properties is essential for practical applications like thermometry and engineering solutions.
The thermal expansion of a body is defined as the change in its dimensions, either length, area, or volume, when the temperature of the body is changed. When the temperature increases, the particles of the body move vigorously, which makes the body expand.
Types of Thermal Expansion:
1. Linear Expansion: Change in length of a solid body when heated.
Example: Expansion of a metal rod.
2. Apparent Expansion: Change in area of a body when heated.
Example: Expansion of metal sheet.
3. Volumetric Expansion: Change in volume of a body when heated.
Example: Expansion of a gas or liquid in a container.
Click for more:
https://www.tiwariacademy.com/ncert-solutions/class-11/physics/chapter-10/