It is generally used for measuring concentrations in liquids, and only rarely for gaseous concentrations. This unit expresses the concentration in one litre of air (1000mL) of a substance in terms of its mass (measured in milligrams). Molarity is a measure of number of molecules per unit volume, and ppm (parts per million) is a measure of proportion by mass. It is primarily used for particle-like substances, and only rarely for gaseous concentrations. Solve this problem either by using dilution factors or by setting up a unit conversion calculation. Follow Us: For dilute solutions, convert molarity to ppm by multiplying the molarity by the molecular mass of the solute, then multiplying the result by 1000. This unit expresses the concentration in one cubic metre of air (equivalent to 1L or 1000mL) of a substance in terms of its mass (measured in milligrams). This unit that expresses concentration in parts per million is measured as the volume (denoted in litres ) of a substance found in 1L of a medium such as air. This unit expresses concentration in parts per hundred (percentage) of a substance in 100mL of a medium such as air. Mg/L Units for measuring concentration Common units for measuring concentration % (percent)
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