lets take a container filled with water,we know that water has some intermoleculerspace then if we poured a glass of water into the container  why the volume increases why cant it go to that spaceof the water that was filled in container? 

We know that the liquid state of matter is an intermediate between the solid and the gaseous state. The intermolecular distances between the particles in a liquid are smaller than solids but greater than gases. Also the intermolecular forces between the particles of a liquid are weaker than solids but stronger than liquids. As a result even though the liquids do not have a definite shape, they have a definite volume. Also, their compressibility is lower than that of gases. This is the reason why when a glass of water is added to a container already containing water, the volume of water increases. Also note that even gases tend to occupy the maximum space that is available to them. 

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