That's because water vapor is so variable in its concentration in the atmosphere.
Showing the amount of gases in the atmosphere as percentages of dry air allows for easy comparison and analysis of the composition of the atmosphere. Since the composition of dry air is relatively stable, expressing the gases as percentages of dry air helps to standardize the data for scientific purposes.
Nitrogen (about 78%) and oxygen (about 21%).
line graph
Cirle Graph.
Perhaps because it's so variable, and always so small. The water vapor content in the atmosphere is never more than about 5%, but it can be more or less depending on location, time of day, altitude in the atmosphere, weather conditions such as fog, clouds, temperature, etc.
Showing the amounts of gases in the atmosphere as percentages of dry air allows for easier comparison and understanding of their relative concentrations. It provides a standardized framework that eliminates the variability that water vapor would introduce, making it simpler to analyze and compare the composition of the atmosphere.
The atmosphere of the Earth is composed of different gases. Some of these gases include nitrogen, oxygen, argon, and carbon dioxide.
A pie chart with the percentages of nitrogen, oxygen, and other gases in the Earth's atmosphere typically shows nitrogen at around 78%, oxygen at roughly 21%, and other gases like argon, carbon dioxide, and neon making up the remaining 1%. Each segment of the pie chart represents the proportionate amount of each gas in the atmosphere.
The atmosphere of the earth is the layers of air that surround the Earth. They contain nitrogen, oxygen, carbon dioxide, water vapor, and small percentages of other gases.
A pie chart is often the best type of graph to show percentages.
It is simpler because the amount of water vapor in the air can change.
Some common gases in the Earth's atmosphere include nitrogen, oxygen, argon, and carbon dioxide. Other gases present in smaller amounts include water vapor, methane, and ozone.