Explain the statement: “The coefficient of linear expansion of iron is 12 × 10⁻⁶ /°C”. Give an example of volume expansion of a liquid due to the application of heat. [2+1]
WBBSE
Class X
Physical Science
Thermal phenomena
03 Mark
2026
The coefficient of linear expansion of iron is 12 × 10⁻⁶ /°C means that for every 1°C rise in temperature, a unit length of iron increases in length by 12 × 10⁻⁶ of its original length.
For example, if the initial length of an iron rod is 1 m, then for a rise of temperature of 1°C, increase in length will be:
ΔL = 12 × 10⁻⁶ m
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