During the thermal expansion of an object, what does its length change depend on?

The length change of an object during thermal expansion is influenced by both the initial length of the object and the increase in temperature it experiences.

When a material is heated, its particles vibrate more and tend to move further apart, causing the material to expand. The degree to which this expansion occurs is not only dependent on how high the temperature rises but also on how long the object is originally. Essentially, longer objects will expand more than shorter objects when subjected to the same temperature change because there is more material to stretch.

Therefore, it is the combination of the initial length and the temperature increase that determines the extent of the length change during thermal expansion. Additionally, while material properties do play a role in how much a specific substance expands for a given temperature change, the question specifically asks about length change in relation to initial length and temperature.