Atmospheric Scientists Often Measure Gases in Parts Per Million by Weight

question 16

Multiple Choice

Atmospheric scientists often measure gases in parts per million by weight (ppm) .If CO₂ is currently 0.04% of the atmosphere,the level expressed in ppm is

• A)4 ppm.
• B)4000 ppm.
• C)400 ppm.
• D)0.004 ppm.

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