12500 ppm CO2 equals what percentage by volume?

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Multiple Choice

12500 ppm CO2 equals what percentage by volume?

Explanation:
Converting ppm to percent by volume uses the idea that percent is per hundred while ppm is per million. Since 1% equals 10,000 ppm, 12,500 ppm is 12,500 ÷ 10,000 = 1.25%. So the correct percentage by volume is 1.25%. If you mix up the scale, thinking 12,500 ppm is 12.5% would treat ppm like hundredths of a percent, which isn’t right. Likewise, 0.125% corresponds to 1,250 ppm, and 2.5% corresponds to 25,000 ppm.

Converting ppm to percent by volume uses the idea that percent is per hundred while ppm is per million. Since 1% equals 10,000 ppm, 12,500 ppm is 12,500 ÷ 10,000 = 1.25%. So the correct percentage by volume is 1.25%. If you mix up the scale, thinking 12,500 ppm is 12.5% would treat ppm like hundredths of a percent, which isn’t right. Likewise, 0.125% corresponds to 1,250 ppm, and 2.5% corresponds to 25,000 ppm.

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