Most Abundant Gas in the Earths Atmosphere

By far, the most abundant gas in the Earths atmosphere is nitrogen, which accounts for about 78% of the mass of dry air. Oxygen is the next most abundant gas, present at levels of 20 to  21%. Although humid air seems like it contains a lot of water, the maximum amount of water vapor that air can hold is only about 4%. Key Takeaways: Gases in Earth's Atmosphere The most abundant gas in the Earths atmosphere is nitrogen. The second most abundant gas is oxygen. Both of these gases occur as diatomic molecules.The amount of water vapor is highly variable. In hot, humid locations, it is the third most abundant gas. This makes it the most common greenhouse gas.In dry air, the third most abundant gas is argon, a monatomic noble gas.The abundance of carbon dioxide is variable. While it is an important greenhouse gas, it is only present an average of 0.04 percent, by mass. Abundance of Gases in the Atmosphere This table lists the eleven most abundant gases in the lower portion of Earths atmosphere (up to 25 km). While the percentage of nitrogen and oxygen are fairly stable, the amount of greenhouse gases changes and depends on location. Water vapor is extremely variable. In arid or extremely cold regions, water vapor may be nearly absent. In warm, tropical regions, water vapor accounts for a significant portion of atmospheric gases. Some references include other gases on this list, such as krypton (less abundant than helium, but more than hydrogen), xenon (less abundant than hydrogen), nitrogen dioxide (less abundant than ozone), and iodine (less abundant than ozone). Gas Formula Percent Volume Nitrogen N2 78.08% Oxygen O2 20.95% Water* H2O 0% to 4% Argon Ar 0.93% Carbon Dioxide* CO2 0.0360% Neon Ne 0.0018% Helium He 0.0005% Methane* CH4 0.00017% Hydrogen H2 0.00005% Nitrous Oxide* N2O 0.0003% Ozone* O3 0.000004% * gases with variable composition Reference: Pidwirny, M. (2006). Atmospheric Composition. Fundamentals of Physical Geography, 2nd Edition. The average concentration of the greenhouse gases carbon dioxide, methane, and nitrous dioxide has been increasing. Ozone is concentrated around cities and in the Earths stratosphere. In addition to the elements in the table and krypton, xenon, nitrogen dioxide, and iodine (all mentioned earlier), there are trace amounts of ammonia, carbon monoxide, and several other gases. Why Is Important To Know the Abundance of Gases? Its important to know which gas is most abundant, what the other gases are in the Earths atmosphere, and how the composition of air changes with altitude and over time for multiple reasons. The information helps us understand and predict the weather. The amount of water vapor in the air is particularly relevant to weather forecasting. The gas composition helps us understand the effects of natural and man-made chemicals released into the atmosphere. The make-up of the atmosphere is extremely important for climate, so changes in gases may help us predict broad climate change. Sources Lide, David R. (1996). Handbook of Chemistry and Physics. CRC. Boca Raton, FL.Wallace, John M.; Hobbs, Peter V. (2006). Atmospheric Science: An Introductory Survey (2nd ed.). Elsevier. ISBN 978-0-12-732951-2.

Healthy Eating Programme at School Essay - 565 Words

Healthy Eating Programme at School This report is being submitted concerning the new Healthy Eating Programme being introduced at School. It is hoped that this report may help with developments. The BYTEZONE The Bytezone is a catering facility in Coedylan School where food is available to buy. The Bytezone sells baguettes, slush puppies and some drinks. The Bytezone used to sell snacks in the vending machines but now have stopped. Vending Machines Some food and drink has been removed from the vending machines at the Bytezone. There is a positive side to this and that is that there are shorter queues at the vending machines which means that the Bytezone is not so†¦show more content†¦Also the price of these drinks has increased greatly the old bottles of water cost 40p and now all of these drinks cost 80p. If the school would like pupils to drink water rather than fizzy drinks then the school should install a water fountain/machine for pupils to get free water. BACKGROUND In the past, Coedylan Comprehensive has sold snacks such as Walkers crisps, varieties of chocolate and cookies and drinks such as Coca-Cola, Fanta, and Sprite. * The availability of crisps has now been changed to Walkers Lites. The reason for this was because the Walkers Lites are supposed to have less fat than in original Walkers crisps. Tests have shown that there is no difference in the amount of fat so why has the school decided on changing the availability of crisps? Walkers have named their crisps Lites because there are less crisps in the packet which means that the packet is lighter than the originals. * Cookies were not served at the vending machines but were sold at the Bytezone. Coedylan has now reduced the serving of cookies to one week in a month. The reason for this is that the chocolate inside has too much fat. 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Thesis Is There a God or is He() an Illusion Essay Example For Students

Thesis: Is There a God or is He(?) an Illusion? Essay An illusion is ones own interpretation and perception of someone or something. It can be a strong belief or a wish. They are not necessarily false or errors. The strength of the illusion lies in the strength of wish fulfillment. Forexample People, at first, interpret phenomenas according to their experienceand knowledge of their every day life. They project their own character intothe circumstance presented and regard it as somehow ensouled. Such indefinitenotions are transformed into a distinct conception of a higher order than humanbeings, and yet somehow resembling them. As it may seem, humans have ametaphysical (speculative) need for a Supreme Being. God, as we call him. Heis the eternal and infinite Spirit, Creator of the Universe, and the ultimatepower. We present him with human characteristics in all concepts of God, whichhas led me to believe that it is not God who created man in His image, but manwho creates God in his. Religion is one such need based on myth and spiritualism. People are taughtabout their religion at a young age, and when they grow up they attempt toaccount for things using the notion of their religion as the basis for theirspeculations. On the other hand, there is no truth so certain as the existence of God. He isthe groundwork of all our hopes, and our foundation of morality and society. Nothing exists without a cause. Although we cant demonstrate a soul-substanceand the immortality of a soul, or demonstrate anything concerning the nature ofGod, there is still a dependency on him, so that we cannot ascribe apersonality to God, in the case that it would make him finite. God is the universe conceived as an eternal and necessary unity. Bibliography:Benedict Spinoza rationalistFreidrick Schleiermacher religionSigmund Freud atheistCategory: Philosophy