# How much will a bar of aluminium ,100 cm long ,expand when heated from 20 celcius to 100 celcius? co efficient of linear expansion of aluminium is 2.5*10 to the power of -5 degree celcius inverse

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by mppv1234

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by mppv1234

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Where, α=expansion on heating=2.5*(10)^{-5} °C

= initial length (100cm)

= Change in length,

= change in temperature = 100°C-20°C=80°C

Using the above formula,

Substituting values:-

Solve, you get

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So the aluminium bar of length 100 cm will expand by 0.2 cm and the bar will expand to 100.2 cm total length.