It is the process by which a solute (solid, liquid or gaseous) in contact with a solvent is dispersed forming a mixture in which the components are not distinguishable. The best example of a solution is a salt dissolved in water, the most common salt is the one we use every day at the table by the time we eat, this salt has a crystal form, is composed of ions sodium positively charged, and ions chloride with negative charge.

When a salt crystal is in contact with big amount of water, ions Chloride, negative charged, will be attracted by the positive side of water which are the hydrogen atoms, they take the ions from the crystal lattice, and the original solid pass to same state of the solvent.
The final mix is homogeneous and have the same properties in the whole mix.

In Chemistry is important to know the amount of solute in a solution, this value is known as Concentration of the solution. The concentration of a solution is calculated using

Concentration\text{ of Solution = }\tfrac{Amount\text{ }of\text{ Solute}}{Amount\text{ of Solute + Amount of Solvent}}

Molarity\text{ = }\tfrac{Moles\text{ }of\text{ Solute}}{Volume\text{ of Solution}}

Next chapter will show different ways to express concentration of solutions.

Dissolving Salt In Water 3D Animation