Solids, liquids and gases. In a solid like this brick, the particles are regularly arranged touching their neighbours and move only by vibrating. This explains why solids have a fixed shape.

Solid-state batteries might be the breakthrough that the industry is looking for, but it’s still unclear when they will reach production vehicles. They are already used in small devices such as ...

Solids valves are used to control or regulate the flow of powder, granular, and other bulk solid materials along a process line. They are also used to control or regulate the flow of solids to and ...