Ask a Question
Notify Me On Question Update
Email this Question
Would like to know how many drops in one ounce of water equals how many parts per million? Or quart ect.
Rate This FAQ
Parts Per Million (PPM)
A unit of concentration often used when measuring levels of pollutants in air, water, body fluids, etc. One ppm is 1 part in 1,000,000. The common unit mg/liter is equal to ppm. Four drops of ink in a 55-gallon barrel of water would produce an "ink concentration" of 1 ppm.
Parts Per Billion (PPB)
One part per billion is 1 part in 1,000,000,000. One drop of ink in one of the largest tanker trucks used to haul gasoline would represent 1 ppb.
The difference between 1 ppm and 1 ppb is important. A prestigious scientific journal recently reported the concentration of a substance as 0.5-1.5 ppm. The real value was 0.5-1.5 ppb. The difference between $1 and $1000!
Parts Per Trillion (PPT)
A unit of concentration used to measure vanishingly small levels of pollutants or contaminants in, for example, body fluids. One ppt is 1 part in 1,000,000,000,000. One drop of ink distributed through the water contained in a total of 4 of the 3-million-gallon reservoirs pictured would result in a final concentration of 1 ppt.
The remarkable advances in the sensitivity of modern analytical techniques makes it possible to detect some substances at the ppt level whose presence would not have been detected using earlier assay methods.
Submit Your Suggestion
Other Questions In This Topic
- Is it safe to defrost meat on the counter?
- How can I eat healthier at fast food restaurants?
- I am going out of the country for a few years and will be unable to purchase powdered sugar and also tomato paste where I will be living. Is there a way I can make these things myself using very basic products?
- Do you have tips to help prevent dehydration?
- what is the best way to clean whole wheat? I am living in Korea and have purchased some wheat that appears to need cleaning, but I don't know how to do it/
- How can I encourage nutritious eating habits in my preschooler?
- How do you read the code on canned goods to determine the expiration date?
- What is the effect of irradiation on food packaging, especially on p.v.c?