In the case of fine dust measurements, however, the particles are usually several days to weeks old. This is because the fine dust particles are first collected on filters and only analysed later.

Calculations can be carried out to find out concentrations of solution and uncertainties in measurements. Calculations in chemistry (Higher) - AQA The mole is the unit for amount of substance.

Used to hold, mix or heat substances ... used to measure the volume of liquid. Dropper/pipette A thin, tapering glass or plastic tube used to eject or suck in a small amount of fluid.