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In my lab of linear expansion, I need to find out the coefficient of linear expansion. The data I got for an aluminum rod are initial length is 59.7cm, the change in length is 95mm, the change in temperature is 75.4 Celsius degrees. I converted 59.7cm to 0.597m, and 95mm to 0.095m. But I got no where near the standard coefficient of linear expansion for aluminum, which is 22.5*10^-6, how come????????


  • Physics -

    Your length increase measurement was wrong by a wide margin. There is no way an aluminum bar's length will increase 16% due to a 75 degree C temperature change.

    Are you sure the length change was not 95 micrometers? How did you measure it?

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