The ==Key Stage 3=====Meaning===[[Concentration]] is the ratio of a [[solute]] to a [[solvent]]. ===About Concentration===: The more [[solute]] in a [[solution]] the higher the [[concentration]].: The more [[solvent]] in a [[solution]] the lower the [[concentration]].: [[Concentration]] can have several [[unit]]s but the most common one used in science is [[Molarity]] (M).