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The concept of linear expansion pertains to how materials change in size when subjected to temperature changes. Coefficients of linear expansion specifically reference the change in length of an object in one dimension, making it primarily relevant to how materials expand or contract linearly. However, when discussing changes in volume, one must consider volumetric expansion, which involves changes in all three spatial dimensions.

The correct understanding is that while linear expansion coefficients are calculated based on length changes, they indeed do not take into account changes in volume. Volume change is described by volumetric expansion coefficients, which are different because they account for changes in all three dimensions. It is essential to recognize that linear coefficients focus solely on one-dimensional changes, so they do not permit or describe the phenomenon of volume change effectively.

Regarding why the other options are less suitable, the coefficients of linear expansion can indeed vary based on the material's properties and its specific response to temperature changes, which relates to dependence on the material and temperature but does not directly address volume change in a linear context.