Quick Answer: The Linear Expansion Apparatus measures how much a metal rod lengthens when heated, so students can calculate the coefficient of linear expansion of the material. The change in length is recorded together with the rise in temperature.
Last updated: October 2026
Key Features
Measures the change in length of a metal rod due to heating
The rod is fixed in the apparatus and its expansion observed as it is heated
Coefficient of linear expansion = change in length / (original length × rise in temperature)
Rods of different metals can be tested and compared
Explains the expansion gaps left in railway tracks, bridges and pipelines
Technical Specifications
Specification
Value
Application
Study of linear expansion of solids
Measurement type
Change in length due to heating
Operation
Heating and measurement-based experiment
Concepts covered
Heat, temperature, thermal expansion, linear expansion, coefficient of expansion
About This Product
Solids expand only slightly when heated, and this apparatus makes that small change measurable. Students record the original length and starting temperature, heat the rod, note the expansion and final temperature, and work out the coefficient, then relate the result to the gaps left in rails, bridges and metal structures.
Frequently Asked Questions
How is the coefficient of linear expansion calculated with this apparatus?
Divide the change in length by the product of the original length and the rise in temperature. All three values are recorded during the experiment.
