# Why is it difficult to include water vapor in a graph that shows the percentages of various gases in the atmosphere?

Quite probably because the percentage of water in the atmosphere is a function of temperature.

The saturated water vapour pressure must always be used to make corrections when a gas is collected by bubbling through water and displacing a volume of water in, say, a graduated cylinder. The water vapour content of the atmosphere is known given a temperature and these are extensively tabulated.

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Water vapor levels in the atmosphere vary widely both spatially and temporally, making it challenging to represent accurately in a graph showing percentages of gases.

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