The main difference between fluids and solids lies in the fact that the first ones have the ability to flow, blend and intermix. Ink completely mixes with water if we stir it up the water.
The important characteristic of fluids is that they do not have their own shape. Fluids always take the shape of a vessel in which they find themselves.
In spite of basic similarities fluids possess quite a wide range of various characteristics. Water and air for example differ from each other in a very obvious way, so by no means we can lump the two of them together.
According to these differences we classify fluids into two subgroups (LIQUIDS and GASES).
