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V = 3.4 mg Red Dye / 0.17 mg/L = 20 Liters of water in the fish tank.

Congratulations!  You've made it to the end of the first lesson!

Now you can explore some real-life examples of how these experiments are used:

How do environmental scientists use these kinds of experiments in real life?

Scientists can add a harmless tracer dye to a body of polluted water, and see where the dye goes.  This can help them trace the paths that other pollutants have taken in the water. 

If the dye reaches an equal concentration everywhere, they can measure what the final concentration of the dye is.  From the concentration and the mass of dye added, they can calculate the volume of the body of water. 

If there are other pollutants in the water, the scientists can calculate how much of them were dumped into the water.  Here's how:  they would know the volume of the water from their tracer dye experiment.  Then they could estimate the amount of the pollutant dumped, using the same equation you used: 

 m = c x v .

View an actual project using tracer dye!


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