The atmosphere can be divided into five layers according to the diversity of temperature and density. One millibar is defined as 1000 dynes per square centimeter (1 dyne is the force required to accelerate 1 gram of a mass 1 centimeter per second per second). Despite high vertical pressure gradient, there is weak upward wind because the pressure gradient gets weakened by the Gravitational force. The atmosphere is essential for the survival of plant and animal life. Atmospheric pressure. Download ClearIAS Mock Exams apk 11 for Android. ii) Air pressure at sea level is lower than at the mountain top. It decreases at the rate of 1 degree Celsius for every 165 m of height. Weather related incidents do not take place in this layer. It is from asthenosphere that the molten rock materials find their way to the surface. Try ClearIAS Mock Exams App. The air is a mixture of several gases and it encompasses the earth from all sides. It is measured in force per unit area. Evolution and present composition of the atmosphere • For life to flourish on the surface of the earth, the atmosphere needs to have essential components like ox-ygen for respiration, CO 2 and other greenhouse gases to maintain the temperature on the surface, ozone to protect life from ultraviolet radiation and the right atmospheric pressure. It contains life-giving gases like Oxygen for humans and animals and carbon dioxide for plants. It envel… THANKS FOR SHARING SUCH A HELPFUL NOTES, These notes are very specific,to the point and easy understand.thnq for sharing. The composition of the atmosphere is not static and it changes according to the time and place. Take UPSC Civil Services Exam Prelims Mock Tests. The atmosphere is a mixture of different types of gases. CO2 is not causing global warming! This rising volume of carbon dioxide is the main reason for global warming. 3. Atmospheric pressure is the weight of atmospheric components such as dust, air, per square centimeters in a particular location is caller atmospheric pressure. (See Major Ocean Currents: How to learn faster?) Other gases like argon, carbon dioxide, neon, helium, hydrogen, etc. Very Nice article. UPSC CSE Mains 2017 General Studies 1 (GS 1) Question Paper. We write simple, easy to understand articles, but always ensure high standards of quality. There are different types of movements of ocean water under the influence of different physical characteristics like temperature, salinity, density, etc. Sir,can we get topics separately or objective types…. The primary greenhouse ‘gas’ is water vapour in clouds. General Circulation of the atmosphere is one of many concepts for UPSC Geography that candidates must familiarize themselves with. An atmosphere (atm) is a unit of measurement equal to the average air pressure at sea level at a temperature of 15 degrees Celsius (59 degrees Fahrenheit). You all know that the ocean water is never still. Atmosphere is the air surrounding the earth. Its main feature is its zonal character known as pressure belts. 2) Consider the following statements and identify the right ones. Atmosphere is the air surrounding the earth. Wladimir Köppen (1846– 1940; pronounced like “kur-pin” with a silent r) was a Russian-born German climatologist who was also an amateur botanist.. Required fields are marked *, "Working 24*7 in the police for the last 5 years and been out of touch with the preparation, I took the guidance from your website, especially the ClearIAS prelims test series. Atmospheric pressure is also measured using an aneroid barometer, in which the sensing element is one or more hollow, partially evacuated, corrugated metal disks supported against collapse by an inside or outside spring; the change in the shape of the disk with changing pressure can be recorded using a pen arm and a clock-driven revolving drum. UPSC: Latest News, IAS, IPS, UPSC Online Preparation, Last updated on January 26, 2017 by Clear IAS Team. It also decreases from the equator (or from the low latitudes) towards the poles (or towards the high latitudes). At sea level, the average atmospheric pressure is 1 atm or 1,013.2 mb or 1,013.2 h Pa (kilo Pascal). This is very important from UPSC point of view. These variations are highly significant in terms of wind direction and speed. This is the most important layer of the atmosphere because all kinds of weather changes take place only in this layer. The post UPSC CSE Mains 2017 General Studies 1 (GS 1) Question Paper appeared first on ClearIAS. Atmospheric pressure is the weight of a column of air contained in a unit area from the mean sea level to the top of the atmosphere. Its maximum amount in the atmosphere could be up to 4% which is found in the warm and wet regions. The temperature here starts increasing with heights. As the Pressure depends on the number of air molecules present at any place, it varies both vertically as well as horizontally. When the volume of other gases remains constant in the atmosphere, the volume of the carbon dioxide has been rising in the past few decades mainly because of the burning of fossil fuels. Horizontal distribution of pressure is studied by drawing isobars (lines connecting places having equal pressure) at constant levels. Your email address will not be published. This pressure is called atmospheric pressure. The horizontal variation of the Pressure depends on the differential heating (insolation) of the surface which causes the differential air volumes. The highest pressure is at sea level and the lowest pressure is at the end of troposphere. It acts as a filter and absorbs the ultra-violet rays radiating from the sun and prevents them from reaching the surface of the earth. The air is one among the necessary conditions for the existence of life on this planet. 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