Solute: the substance dissolved; the substance present in a solution in the lesser amount.
Solvent: the dissolving medium; the substance in a solution in the greater amount.
Solution: a homogeneous mixture of two or more substances.
Vol% = 100*volume of solute/(volume of solute + volume of solvent)
mass % = 100*(mass of solute)/(mass of solute + mass of solvent)
parts per million
ppm = 10^6*(mass of solute)/(mass of solute + mass of solvent)
m = number of moles of solute/kilograms of solvent
molar concentration or moles per liter or Molarity
M = number of moles of solute/liters solution
Xy (y is subscript) = number of moles of y in mixture/totals moles in mixture