Pressure Gradients Essay Example for Free

Pressure Gradients Essay The atmosphere is composed of a mixture of gases. Air has weight which is directed towards the centre of the earth. The force (weight) of air per unit area acting on object on the earth is called the atmospheric pressure (Diane, 11). The atmospheric pressure is measured by an instrument called a barometer. On a map, regions of equal pressure are linked by lines called isobars. These lines are drawn in such a way that they never cross each other. The drawing of these lines is based on the average sea level pressure reports. It is true that majority of the weather stations are situated some heath above sea level. Therefore the pressure measured at a particular place has to be converted into sea level pressure before the isobars are drawn. This is due to the fact that pressure decreases with increase in height and the pressures on maps should be as a result of weather conditions and not due to changes in height(Integrated Publishing). According to Diane, Pressure differences occur due to differences in the heat absorbed by the land or water. When air is heated, it expands reducing its density and rises. A partial vacuum is therefore created. Cold denser air flows to take up the space left by the rising air. Basically wind flows from a region of high pressure to a region of low pressure. Therefore, as the pressure changes from place to place, the speed of wind also changes. Diane defines pressure gradient as the rate of change of pressure at a particular time in a particular place. The force that pushes air from a region of high pressures to the region of low pressure is called the pressure gradient force. The force is greater when the pressure gradient is high. Eady notes that the speed of wind depends on the pressure gradient, being higher with greater pressure gradient. It could be expected that the wind will flow perpendicular to the isobars. However the pressure gradient force is somewhat circular as it depends not only on pressure gradient but also on Coriolis Effect, centrifugal force and frictional force (Eady, 142). Coriolis force is brought about as a result of the rotation of the earth. All particles at the surface of the earth rotate once every day. Since the radious is greater at the equator than towards the poles, an object rotates faster at the equator than at higher latitudes. If air moves northwards due to pressure gradient force, it maintains it horizontal motion; in accordance to Newton’s first law of motion (Ferrel, 98). The air therefore moves in a North Easterly direction. In actual sense, wind flows in a circular path (integrated Publishing). For a body to maintain a circular path, centripetal force must be provided. In accordance to Newton’s third law of motion an equal and opposites force called centrifugal force acts on the body (Eady, 139). This force tends to push winds out of their paths and it increases with speed of wind. As wind flows over objects over the earth’s surface it experiences fractional drag. This drag results to wind flowing at an angle to the isobars near the earth’s surface. At higher altitudes air flows parallel to the isobars (Joseph). Diane Fisher contends that in some cases, air cools at a particular place in the troposphere. The cooling results into contraction of air which in turn leads to increase in mass per unit volume of air. This leads to increased pressure directed downwards. This air then attempts to flow outwards towards regions of low pressure. But due to Coriolis force, the air is made to rotate clockwise in the northern hemisphere and anticlockwise in the southern hemisphere. This is referred to as an anticyclone. On the other hand, Diane tells us that a region of rising air of low pressure is called a cyclone. This occurs at the boundary of cold and warm air. It is caused by warm air rising and cools air descending which creates of reduced pressure. An inward pressure gradient is created and in addition to Coriolis Effect causes air to circulate in anticlockwise direction in the Northern Hemisphere and Clockwise in the Southern Hemisphere. The cyclone usually moves upwards and it contributes to the circulation of air in the atmosphere. Works Cited Diane Fisher. â€Å"Become a weather wizard†. In The Technology Teacher, Vol. 61, 2002:11 – 15. Eady, E. T. â€Å"The general circulation of the atmosphere and oceans. † In: The Earth and Its Atmosphere, ed. D. R. Bates. New York, Basic Books, (1957):130-151. Ferrel, W. The influence of the Earths rotation upon the relative motion of bodies near its surface. Astron. J. , Vol V. No. 109, (1858):97-100. Integrated Publishing . http://www. tpub. com/content/aerographer/14312/css/14312_16. htm Joseph E Van Riper. Mans Physical World. New York: McGraw-Hill Book Company, Inc. 1962.

Christianity And The Just War Theory Essay -- essays research papers

Does the Just War Theory provide sufficient moral justification for Christians’ involvement in war? The Just War Theory is a set of criteria that are used to judge whether a war is morally justifiable. It was St Augustine in the third century that formulated the Just War theory, and was formalised 10 centuries later by Thomas Aquinas. There are seven criteria by which a war can be judged to be just. Among the rules are Just Cause – there must be a very good reason for going to war, such as protecting your country from invasion. There should be a formal declaration of war by the legal government. It has to be the last resort and all other alternatives must be exhausted. There must be a reasonable chance of success and great care must be taken to avoid injuring civilians. The Just War Theory is still believed today to be the only way that Christians can morally justify war and is often referred to by leaders of Christian countries when they make claims to be fighting a just war. There is widespread ignorance of the details of Just War but there is also much room for different interpretations of the criteria. I personally feel that it depends on each individual situation as one set of rules are not always applicable to all circumstances. In some situations, the causes may seem to be just but not according to the just war theory. A war can only be judged to be just if the criteria are met – not if those involved try very hard to meet them. The aim of the just war is to provid...

Is there any relief to the grimness in section one of 1984?

In the dystopian society Orwell creates in 1984 there is an overwhelming, yet unsettlingly familiar sense of irony; the omnipotent leaders of Oceania, Big Brother and the inner party members, claim to be controlling the everyday lives of the citizens in order to bring them a better life, ‘for the good of the party' and ‘our new, happy life'. However, this is the distinct opposite to the reality Winston Smith lives in; a totalitarian state which professes to bring hope and happiness, yet in actuality drains any sense of optimism and joy. In a place bereft of any hope, Winston Smith finds himself desperately searching for a sense of individuality and relief. It would be wrong to assume, however, that Orwell's society is completely and utterly deprived of solace, there are, at least in section, one faint glimmers of hope, small fragments to which Winston clings; a person he sees in the corridor, the masses of lower classes, the diary in which he writes. There are little details in Winston's life that do bring a sense of relief; the fact that luckily his room contains an area in which he can remain unseen by the telescreens. This offers him a minute place of solitude in a society where Big Brother is omnipresent. The presence of his diary and his pen, there is relief in the fact that he is able to write, even if it is extremely dangerous to do so. Remnants of the past can still be found in some places, the paper weight Winston finds, for example becomes something beautiful and rare that brings colour to the grimness of his situation. The shop in itself appears to be a place of hope, Winston finds himself strangely drawn back to it. Full of memories and paraphernalia of the past it offers some relief to the dark and bleak present. Winston also finds relief in people, evidently the wrong ones as the reader later finds out, but nonetheless the character of O'Brien appeals to him, † we shall meet in a place where there is no darkness† Winston is told by him and this gives him hope. He writes his diary to O' Brien and thinks this may be the only person who understands and feels the same way, offering him a sense of comfort ‘†I am with you†¦. I am on your side† O' Brien seems to be saying' and although Winston is gravely mistaken, there is some relief that he believes somebody empathises with him, this gives him faith. â€Å"Proles and animals are free† states the party slogan, and Winston believes with conviction that the only prominent hope are within these ‘swarming disregarded masses'. The proles seem free, whereas the rest of the population is indoctrinated and docile. The proles can express themselves, they are allowed to be passionate even if it only about beer and the lottery. It is ironic that passion can also be evoked in the outer and inner party members, yet this passion is in relation to ‘the two minute hate' and to Big Brother, rather than a passion for freedom and for hope. Thus continuously Orwell writes that ‘if there is hope, it lies in the Proles'. Orwell himself states that the proles â€Å"represent real human beings with their emotions intact and not driven out of them. † Winston recognises that the Proles are the key to change, as they are the only people capable of thinking for themselves. However this is only a limited relief, the proles have been tamed and occupied by the party, they are allowed certain freedom because they do not have the ability to rebel, as Orwell writes they are not conscious of their own strength, â€Å"Until they become conscious they will never rebel, and until after they have rebelled they cannot become conscious. † To that end hope may indeed lie with the proles yet it seems unlikely to amount to the rebellion needed to bring relief to Oceania. The idea that logic, tautologies and mathematics can never be truly altered is a key theme throughout 1984, in section one there is still hope and optimism in these fields, or so Winston beliefs. â€Å"Freedom is the freedom to say that two plus two makes four. If that is granted, all else follows. † This belief gives Winston something to hold on to, he knows that it is true and it offers a sort of promise that at least something is inalterable. Winston wonders whether if everybody believed that two plus two makes five, it be considered truth. Yet the fact remains that although history is rewritten, and events and people erased, no bureaucracy can alter the universal laws of maths. In section one Memory features as an outlet for relief and a place of hope, although it is evident that people do not remember the past as well as they should, Winston still has vague recollections and images from his past, the images of his mother and sister haunt him, but at least they show that there was something before. proles remember lottery†¦.. remembers songs†¦.. †¦ shop keeper memory†¦. man in pub†¦ 984 is often described as a warning to the future; Oceania has strong parallels with Stalin's Russia and the message still resonates with the modern reader familiar with the sense of paranoia and increasing government restrictions in light of international events. Perhaps hope can be drawn from Orwell's footnote in the beginning pages, stating that ‘newspeak' was the official language, the past tense suggests, as propounded by Margaret Atwood, that the dystopia was not eternal. For Winston Smith, in the immediate present of Oceania, there is a small sense of relief, yet only perhaps because he is looking for it. He perceives himself to be different from the rest of the outer party members and this helps him to find some relief, yet at the same time also mentally tortures him as he wonders if he is a lunatic, ‘ a minority of one'. Although there is some relief to the grimness in section one, there is not quite enough to combat the totalitarian control of Big Brother, it seems that Winston Smith eventually starts to take risks, not because he is hopeful or experience relief, but because he becomes even more apathetic towards his own existence.

Criminal Crime A Crime, Assault, Burglary, And Assault

When hearing about a crime that has been committed, individuals do not tend to think about spending time with that criminal. This is on account of the individual portrayed as a criminal, one who has the mentality of perpetrating a rough offense. Regardless the age of the criminal, he or she in any case would be an unappealing party to those that are â€Å"model citizens.† Felony crime is characterized by the Department of Justice as â€Å"crime, assault, burglary, and attack† (Legal Dictionary). According to the Uniform Crime Report, property crime is number one of the crimes committed by persons under the age of 18. Property crime is also high in numbers for children age 15 and under. Although juveniles arrested for violent crimes have decreased from 2013 to 2014 by 3.8 percent, these crimes are still being committed (Uniform Crime Report, 2014). It is of society’s declaration that any individual who perpetrates a felony crime needs to be arraigned the same way, consequently that minors must be indicted as adults. What is left unsaid is that these same minors have certain reasons as to why they act in the manner that they do. The purpose of this paper is to justify as to why juvenile offenders should only be tried as adults in acts of murder. A crime committed by children is a genuine and developing plague. â€Å"The figures for adolescents carrying out law violations that are heterogeneous or non-genuine mirror those of guilty parties between the ages of eighteen and twenty† (U.S.Show MoreRelatedCrime Is A Major Problem898 Words   |  4 PagesLiterature review Crime is a major problem in Memphis (the Bluff City) that have reached numerous communities in areas such as Frayser (Anthony, Hunter, Jewell, Johnson, Mooreland, 2006). Crime has been a major concern in the bluff city. 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