Chemists use grams per cubic decimetre. Remember that 1000 cubic centimetres (cm^{3}) equals 1 cubic decimetre (dm^{3}) also equals 1 litre (L).

We note that cm^{3} are sometimes called millilitres (mL).

E.g. if l0 g of glucose are dissolved in water and made up in a volumetric flask to 1000 cm^{3}, then the concentration of glucose in the flask is equal to 10 grams per cubic decimetre or 10g.dm^{-3}.

E.g. similarly if l0g of glucose are dissolved in water and made up to 100cm3, the concentration is l0 g in 100 cm^{3} or 100g dm^{-3}.

Concentrations are often expressed in terms of relative unites (e.g. percentages) with three different types of percentage concentrations commonly used:

**Mass Percent = [(Mass of Solute) / (Mass of Solution)] * 100%**

**Volume Percent = [(volume of Solute) / (volume of Solution)] * 100%**

**Mass/Volume Percent = [(mass of Solute) / (volume of Solution)] * 100%**

A volumetric flask is very accurate way to measure a volume, when filled exactly to line. It comes in different sizes.

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