If you cool a solid, the molecules move more slowly and move a little closer together. Step 2 Show an animation to help students compare atoms and molecules in solids and liquids. Explain that the ...

Physicists are gathering in Pittsburgh March 16 through 20 to share their work during the March meeting of the American Physical Society. Offerings so far look closely at the smallest scales: how ...

As water freezes, the attractions the water molecules have for one another overcome their motion and hold them in fixed positions. ... Water molecules move further apart as liquid water becomes solid ...

In solids, it decays into an ionized state—a plasma—called warm dense matter, which is normally found only in extreme settings such as nuclear fusion reactions and the cores of giant planets.