The dots above (representing molecules) show one reason why one material has more or less density than another. Can you see how the molecules of the densest material, water, are more closely spaced ...

Heating a substance makes its atoms and molecules move faster. This happens whether the substance is a solid, a liquid, or a gas. It’s not easy to see it happen in a solid but let’s try it for a ...

For the first time, a team led by Prof. Jian-Wei Pan and Prof. Bo Zhao at the University of Science and Technology of China, have successfully observed scattering resonances between atoms and ...