Question

Concentration of 1 mg per litre is equal to _________ ppm.

Answer 1

HINT: To answer this, remember that ppm is one part in one million of a liquid. Find out what fraction of 1 litre is 1mg and from here you can easily find out the required answer. Remember that per litre is for liquids.

COMPLETE STEP BY STEP SOLUTION: To answer this, firstly let us discuss what ppm means and then we can use the conversion terms to convert mg per litre to ppm.
-‘ppm’ is an abbreviation that we use for parts per notation generally for liquids. It is known as parts per million. We use this measurement to express mass of a chemical or contamination of per unit volume of water.
-One parts per million is basically equivalent to the absolute fractional amount multiplied by one million.
-Let us take some examples to understand it better.
If we mix four drops of ink thoroughly in a barrel of water of volume 55 gallon, this process will produce an ink of concentration 1ppm. We can also think of it like one inch in 16 miles or one second in 11.5 days or one minute in two years.
-Now we have a concentration of solution in ppm it automatically means that the solution is very diluted. We use this notation to express contamination of water.
-Now let us see what 1 mg per litre is equal to in ppm. One ppm is basically equivalent to 1 mg per litre of a solution as we can understand that 1 mg is one part in one million.

So, we can say that 1 mg per litre is equal to 1 ppm and this is the required answer.

NOTE: As we have already discussed above, parts per million is a small concentration however even a smaller concentration is known named parts per billion and it is abbreviated as ppb. It is one part in one billion. We can think of it as one second in about 32 years etc.