A sample of drinking water contains chloroform (chcl3) at a level of 15 ppm (by mass). The percentage by mass of chloroform in the sample is
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15 ppm means 15 parts in 1 millions (10^6)
and percentage always for 100
hence 15 ppm = (15/10^6 )*100
= 15*10^-4
= 1.5*10^-3
and percentage always for 100
hence 15 ppm = (15/10^6 )*100
= 15*10^-4
= 1.5*10^-3
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