"10 to the ninth per liter," or (10^9) per liter, typically refers to a concentration of a substance, indicating that there are one billion (1,000,000,000) units of that substance in one liter of solution. This unit is often used in fields like chemistry and Biology, particularly when measuring concentrations of cells, molecules, or other entities in a liquid medium.
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In order to convert a microliter per liter to a mililiter per liter, just divide by 1,000.
A deciliter is 1/10 of a liter, therfore there are 10 deciliters per liter
10
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10.