* Kinetic Energy: Temperature is a measure of the average kinetic energy of molecules. As temperature rises, molecules move faster and have more kinetic energy.
* Vibrations and Collisions: This increased energy leads to more frequent and forceful collisions between molecules. These collisions cause the molecules to push further apart.
* Expansion: In solids, liquids, and gases, this increased distance between molecules results in expansion.
Exceptions:
While this is the general rule, there are some exceptions:
* Water: Water is unusual because its molecules form strong hydrogen bonds. As temperature increases, these bonds break down, leading to a *decrease* in distance between molecules (up to a certain point). This is why water expands when it freezes, and why ice floats.
In summary:
* For most substances, increasing temperature increases the distance between molecules.
* This is due to the increased kinetic energy of molecules, leading to more frequent and forceful collisions.
* Water is an exception to this rule, with its hydrogen bonds playing a significant role.
