Concentration
In chemistry, concentration is how much of a substance is mixed with another substance.
The substance that is dissolved (shown as the red dye in the example) is known as the solute. The substance in which the solute is dissolved (shown as the water in the example) is known as the 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.
Concentration Media
Test tubes with liquid in which a blue dye is dissolved in different concentrations. In the test tube with dark blue liquid (in front), the blue dye is dissolved in a high concentration. In the following test tubes, the blue dye is dissolved in a lower concentration (and at the same time in a smaller amount, since the volume is approximately the same). Image is AI generated.