Pure substances and formulations

• what is a pure substance

  single element or compound not mixed with any other substance
• pure substances a have specific melting and boiling temperatures, this can be used to distinguish pure substances from mixtures
• what is a formulation

  a formulation is a mixture that has been designed as a useful product
• formulations are made by mixing the components in carefully measured quantities to ensure that the product has the required properties
• Formulations include fuels, cleaning agents, paints, medicines, alloys, fertilisers and food