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Questions and answers on how to convert things from one unit or system to another

Sun Apr 10, 2005 4:59 am

the DDT level measured in a tropical ecosystem were between 0.16 and 0.28 mg per liter
convert it into parts per million?

Sun Apr 10, 2005 5:19 am

You have to ask "per liter of what, and how much does it weigh." Parts per million is a ratio between two like quanties, weight to weight, or volume to volume, not mixed.

If it is a liter of water (or about the same specific gravity) one liter of water weighs 1 kilogram, and 1 mg/kg would be 1 ppm.
Blood, saline, etc are slightly heavier than 1 kg/L, fats and oils are slightly lighter.

Mon Apr 11, 2005 2:10 am

jaweria wrote:the DDT level measured in a tropical ecosystem were between 0.16 and 0.28 mg / L
convert it into parts per million?

Mon Apr 11, 2005 3:44 am

Anonymous wrote:
jaweria wrote:the DDT level measured in a tropical ecosystem were between 0.16 and 0.28 mg / L (maximum acceptable concentration)in water
convert it into parts per million?