Disolved oxygen (DO) in water should be?
Correct answer: D. 4 to 5 ppm
- A. 400 to 800 ppm
- B. 4000 to 8000 ppm
- C. 0.4 to 0.5 ppm
- D. 4 to 5 ppm
Explanation
Dissolved oxygen in reasonably healthy water is commonly around 4 to 5 ppm or higher, with cold, clean water holding more oxygen. The hundreds or thousands of ppm options are far too high for ordinary water.
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