Lo que caracteriza y define un estado físico de la materia son las fuerzas que actúan en el interior; la cohesión, que tiende a alinear las partículas, y la repulsión, que tiende a distanciarlas. Cuando la fuerza cohesiva de repulsión supera a la de repulsión, la sustancia se presentará en la fase de agregación llamada de sólido; cuando las fuerzas presentan la misma intensidad, tenemos un líquido; cuando la fuerza de repulsión supera a la de cohesión tendremos un gas.
Cada uno de los diferentes estados físicos se distingue de los otros, entre otros factores, por su forma y volumen. El estado sólido presenta forma y volumen constante; el líquido presenta forma variable y volumen constante y el gaseoso tiene forma y volumen variables.
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