1000 i think
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1000 mg = 1 g 1000 g = 1 kg ⇒ 1000 x 1000 mg = 1 kg ⇒ 1000000 mg = 1 kg ⇒ 150 mg = 150 ÷ 1000000 kg = 0.00015 kg
1 g = 1000 mg 1 kg = 1000 g ⇒ 1 kg = 1000 x 1000 mg = 1000000 mg ⇒ 544 kg = 544000000 mg
Since 1 mg = 0.001 gram and 1 kg = 1000 gram, to convert from mg to kg you need to divide by a million.
1 mg/kg = 1 ppm 1 mg = 1000 micrograms (ug) so 10 ug/kg = 0.01 mg/kg = 0.01 ppm
1 kg = 106 mg so 136 kg = 136*106 mg = 1.36*108 mg