![]() ![]() ![]() The physical nature of the material also has consequences for its spread. In other words, powders will burn more easily than solid blocks of material. In cases of fire, the surface area of the solid is important to consider. Solids need further assistance to move greater distances and in general are easier to contain. Solids can only change their shape by force, as when broken or cut. As a result, a solid has a stable, definite shape, and a definite volume. The forces between particles are strong so that the particles cannot move freely but can only vibrate. In a solid the particles (ions, atoms or molecules) are closely packed together. ![]() For example, gases are stored under pressure and if stored under sufficient pressure, they will liquefy. This refers both to the physical state of the material at ambient temperature and the state in which the material is either stored or transported. The physical state of the material will have a bearing on the risks it poses and on how it should be dealt with effectively at the incident. Four states of matter are observable in everyday life: A state of matter is one of the distinct forms that matter takes on. In physics, matter can be defined as any substance that has mass and takes up space. ![]()
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