42 % to ppm

42 % = 420,000 ppm

%ppm
36 %360,000
38 %380,000
40 %400,000
42420,000
44 %440,000
46 %460,000
48 %480,000

42 % = 420,000 ppm

Formula

1 ppm = 1 mg/L (aqueous, density ≈ 1 kg/L) · 1 ppb = 0.001 mg/L · 1% = 10,000 ppm