Thermal Physics
Learn the key concepts of Thermal Physics for A/L Physics, explained simply · Aligned with the NIE syllabus
Where this fits in the syllabus
Grade 1 · Term 2
What you'll learn
Learn the key concepts of Thermal Physics for A/L Physics, explained simply
About A/L Physics: The A/L Physics syllabus is structured across two academic years, covering fundamental and advanced topics in mechanics, waves, electricity, and modern physics. Every topic on Idasara Academy is mapped directly to the NIE curriculum.
Linear Expansion
The increase in length of a solid when its temperature rises.
When a solid rod is heated, its atoms vibrate more vigorously, increasing the average separation between them. This results in a proportional increase in length, directly dependent on the original length and the temperature change. For example, railway tracks have expansion gaps to prevent buckling on hot days.
Area (Superficial) Expansion
The increase in surface area of a solid when heated.
For a thin plate or sheet, the area expands in two dimensions. The coefficient of area expansion is approximately twice the coefficient of linear expansion for isotropic materials. A bimetallic strip in a thermostat uses this principle to bend and break or make an electrical circuit.
Source: Idasara knowledge pack — english/AL_SCIENCE/physics v19, short_notes: Lesson 4.2 - Thermal Expansion
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