The cinetic molecular theory

The matter is composed of a large number of very small particles, which is why they can not fail to see the microscope. These particles have a determined movement and a distance of separation, that you are a function of temperature and the physical status you meet in substantiates it.

Solids

The particles are very proximate between them in the solids. They characterize the solids to have own form and occupy a constant volume.

Liquids

The particles are next in the liquids, but no so much I eat in the solids. They are united between them for attractive weaker forces than in the solids. These forces permit that some may slide particles themselves for on the other ones. The liquids have variable forms and they adapt themselves in the containers that you contain it. They have a constant volume.

Gases

The particles are widely separated in the gases some of another one. The particles can move this way and that, colliding with the walls of the containers that contain them. The kinetic theory allows justifying that gases have form and variable volume and that they may spread out and compressing without difficulty.