Even when liquids change their shape, they always take up the same amount of space. Their volume stays the same. Examples of gases include steam, helium and oxygen. They are often invisible.

Gases, on the other hand ... they gain energy and can move more freely, changing from a solid to a liquid, for example. This basic model is, however, just that: there are many, many more states ...

By linking theoretical predictions with neutron experiments, researchers have found evidence for quantum spin ice in the material Ce2Sn2O7. Their findings, which may inspire the technology of tomorrow ...

Students explore the attractions and motion of atoms and molecules as they experiment with and observe the heating and cooling of a solid, liquid, and gas.

In gases the particles are far apart ... so would feel very heavy. Some liquids have a higher density than solids. For example, wood is a solid but has a lower density than water, which is ...

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