Define PPM.

Explanation

Expression :
` ("Number of part of the components ")/( " Total number of part of all components ") xx 10 ^( 6) `
` ("Mass of the solute ")/( "Mass of the solution ") xx 10 ^(6) `
Iilustration
50 mL of tap water contains 20 mg of dissolved solids . The TDS value in ppm is
` ("Mass of the dissolved solids ")/( " Mass of the water ") xx 10 ^(6)`
` =( 20 xx10 ^(3)g)/( 50 g ) xx 10 ^( 6) =400 ppm `