# Is there any difference in the effect of linear dilation in between a bar and a hollow bar? Which...

## Question:

Is there any difference in the effect of linear dilation in between a bar and a hollow bar? Which ones dilates the most? My

## Thermal expansion of the object.

Most materials expand on heating. The solid objects expand when heating due to the expansion of interatomic distance. The change in length of the sample is proportional to the initial length and the temperature change.

## Answer and Explanation:

The formula of linear expansion

{eq}\Delta L=\alpha L_0\Delta T {/eq} (1)

{eq}\alpha - \text{coefficient of linear expansion} {/eq}

{eq}L_0 -\text{initial length} {/eq}

{eq}\Delta T - \text{temperature change in Kelvin or Celsium} {/eq}

It is seen from formula (1) that linear expansion for two length similar bars depends upon the {eq}\alpha {/eq}, that is the material from which they are made.

In this case, both bars have the same size and are made with the same material.

Therefore, when their temperature changes by the same number of degrees {eq}\Delta T {/eq} both the bar and a hollow bar have the same dilation.

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from UExcel Physics: Study Guide & Test Prep

Chapter 11 / Lesson 8