Wouldn't the solid expand in all directions?

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The discussion centers on the concept of solid expansion, questioning why a solid expands outward rather than inward. Participants clarify that as a solid expands, all distances between points increase, meaning dimensions x and y do not decrease. The expansion occurs uniformly in all directions to prevent internal stress, as there is no fixed outer border to restrict this growth. The distinction between solids and liquids is emphasized, highlighting that solids do not behave like liquids during expansion. Overall, the conversation reinforces the understanding that solids expand uniformly rather than contracting in any direction.
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In this case, wouldn't the solid expand in all directions? Wouldn't x and y decrease?
 
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MathewsMD said:
In this case, wouldn't the solid expand in all directions? Wouldn't x and y decrease?
If every distance in the solid expands, why would you expect a contraction of the material along the inner edge?

(No, x and y do not decrease)
 
mfb said:
If every distance in the solid expands, why would you expect a contraction of the material along the inner edge?

(No, x and y do not decrease)

Why is it that the solid only increases outward, though? Why does it no expand inwards as well? This would mean x and y (as shown in the picture) are decreasing. I just can't seem to understand why the object would grow in one direction for each component (horizontal and vertical) when looking at this image.
 
It is growing in all directions - every distance between points increases, as the whole material stretches.
As long as there is no fixed outer border which stops expansion in that direction, a uniform expansion of everything is the best way to avoid internal stress.
It is not a liquid...
 

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