7kg of lead can safely be dissolved in 1000 kg of water.
It is a unit of measurement of concentration , also known as parts per million.
Amount of solute in 1 million parts of solution
1ppm = 1mg/kg
The maximum permitted level is 7ppm
This means 7mg /kg
For 1000 kg of water = 7000mg lead = 7kg of lead is permissible.
To know more about ppm
https://brainly.com/question/16727593
#SPJ1
