Concentration
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These glasses containing red dye show changes in concentration. The solutions on the left are more diluted, and the solutions on the right are more concentrated.
In chemistry, concentration is how much of a substance is mixed with another substance.
Substance that is dissolved (i.e. red dye in the example) is known as solute. Substance, in which solute is dissolved (i.e. water in the example) is known as solvent.
To concentrate a solution, one must add more solute, or reduce the amount of solvent. To dilute a solution, one must add more solvent, or reduce the amount of solute.
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