Percent by mass

• Concentration


  The amount of solute to a given amount of solvent in a solution
• ppm


  Parts per million, a unit for expressing dilute concentration
• ppm


  • x10^6
• Percent by mass


  The ratio of the mass of a solute to the mass of the solution multiplied by 100
• Percent by volume


  The ratio of the volume (mL) of a solute (liquid) to volume (mL) of solution multiplied by 100
• Proof is twice the percentage by volume of ethanol present