Solve the following examples.
At 15 °C the height of Eifel tower is 324 m. If it is made of iron, what will be the increase in length in cm, at 30 °C?
Given data:
Height of tower = 324 m
Initial temperature = 15 °C
Final temperature = 30 °C
Expression to calculate the increase in length during thermal expansion is as follows.
● 
= increase in length
● 
= increase in length
● 
= coeffiocient of linear expansion of iron. Its value is 11.5 × 10-6°C.
● 
= increase in temperature
Substitute the given values and value of 
.
324 m)(11.5×10-6 °C)( 30 ° -15 °C)
= 0.056 m
= 0.056 m
= 5.6 cm
Increase in length of tower at 30 °C is 5.6 cm.
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