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The gaseous state of aggregation should only be discussed briefly here, because this area is treated in much more detail in physics, especially the kinetic theory of gases.
Considerable forces of attraction are usually effective between the particles in solids. The opposite is the case with gases. The interactions between the gas molecules or noble gas atoms are very slight or almost nonexistent. In terms of physical behavior, gases are therefore very similar. As a first, fairly good approximation, a simple model, the ideal gas, can be used to describe the gases together.
- According to the model concept of the ideal gas, the gas particles are in constant, random movement, and they often collide with the container wall. The number of particles in a gas volume is very large, but their intrinsic volume is negligible in relation to the container volume, i.e. the gas particles are imagined as mass points. No forces should act between the particles.