How Do Old Refrigerators Affect the Ozone Layer Essay Example for Free

How Do Old Refrigerators Affect the Ozone Layer Essay The ozone layer prevents ultraviolet sunlight from reaching Earth. (The Ozone hole, 2012). Without the ozone layer, it would be more likely to get skin cancer, eye damage, harm wildlife, reduce crop yields, and change the ocean food chain. The ozone is a molecule made up of three oxygen atoms. Ground-level ozone is the main component of smog and is harmful to humans. Atmospheric ozone collects in the stratosphere, which is about nine to twenty-two miles above the surface of the Earth. It was discovered in 1985 that there was a hole in the ozone above Antarctica. CFC’s, were constantly eroding our ozone layer. (Roach, 2010). In old refrigerators, ammonia gas is used to keep the refrigerator cool. Pure ammonia gas is highly toxic to people and if a refrigerator containing it leaked, it would pose a threat. Switching to CFC’s was a â€Å"nontoxic† replacement that depleted the ozone layer. Then they switched to a more environmental friendly coolant. Although many refrigerators still use ammonia. (Brian; Elliot, 2006). Refrigerators need five major components to keep cool. The compressor compresses the ammonia gas and the compressed gas heats up as it’s pressurized. The coils on the back of the refrigerator let the hot ammonia gas disperse its heat and the gas condenses into liquid at high pressure. The high pressure ammonia liquid flows through the expansion valve. One side of the valve has high pressure ammonia liquid and the opposite side is a low pressure area because the compressor sucks gas out of that side. The liquid ammonia immediately boils and vaporizes with the temperature dropping to -27 degrees Fahrenheit which makes the inside of the fridge cold. The compressor sucks up the ammonia gas and the cycle repeats. (Brian; Elliot, 2006)The coolant is trapped inside coils and makes a circuit through them and changes back and forth from a liquid to a gas. Ammonia gas does not affect the Ozone layer but it is highly toxic to humans. When they switched to CFC’s, that’s when the refrigerators added to the list of things depleting the Ozone Layer. Du Pont discovered this replacement in the 1930’s. They are used in a variety of industrial, commercial, and household applications. The CFC’s were released into the atmosphere and went up into the stratosphere. In the 1970’s, it was discovered that the CFC’s in use are harmful to the Ozone Layer. The ultraviolet radiation at the atmospheric altitude breaks down CFCs, freeing the chlorine. Under the proper conditions, this chlorine has the potential to destroy large amounts of ozone. As of the 1990’s, they put a more environmental friendly coolant in refrigerators.

A kite is a victim Essay -- essays research papers

  Ã‚  Ã‚  Ã‚  Ã‚  The Poem titled â€Å"A Kite is a victim† written by Leonard Cohen contains multiple tropes. Through my own analysis I propose that the author’s central focus concerns life. Cohen discusses the relationships and accomplishes that we make throughout our lifetimes. In my opinion, the kite is a metaphor for the essence of life and living. Each of the four stanzas in the poem begins with a trope. In every case the tenor is the kite. These tropes will be analyzed with regard to the central theme of the poem.   Ã‚  Ã‚  Ã‚  Ã‚  The first tenor that I will discuss can be found in the first line of the first stanza. Cohen writes: â€Å"A kite is a victim you are sure of†. This is personification. Leonard Cohen uses a human quality â€Å"victim† to describe an inanimate object. The tenor would be the kits and the vehicle is clearly victim. The first stanza presents the qualities of life and love. The kite is a victim like life is a sacrificial and sometimes inevitably painful. As much as we have happiness we must also experience sadness and hurt. You are sure of it because it is part of everyday. You know that you must experience these hard ships in order to move forward. Cohen describes it as being tempting because it pulls. Life is interesting because you cannot control it completely. There are ups and downs just like a kite in the wind.   Ã‚  Ã‚  Ã‚  Ã‚  The next tenors that I will identify can be found in the first stanza in the third and fourth lines. Both of these lines provide an example of personification. Much like the initial line of the poem, these lines characterize the kite with human qualities:   Ã‚  Ã‚  Ã‚  Ã‚  Ã¢â‚¬Å"Gentle enough to call you master,   Ã‚  Ã‚  Ã‚  Ã‚  strong enough to call you fool.† In these examples the tenor is the kite and the entire lines represent the vehicle. A kite cannot be neither gentle, nor strong or call you anything.   Ã‚  Ã‚  Ã‚  Ã‚  These tenors represent the full spectrum of emotions and strength in life. It is as if he is discussing god and the life you have been given. It is gentle enough that you often feel strong and powerful but also strong enough to humble you. The sixth line of Cohen’s poem is a simile. Leonard makes a direct comparison between a falcon and the kite:   Ã‚  Ã‚  Ã‚  Ã‚  Ã¢â‚¬Å"like a desperate trained falcon.†   &nb... ...ugh prayer. Finally, the fourth stanza also contains another example of personification in line 25: â€Å"under the traveling cordless moon.† In this case the kite is not the tenor. Cohen describes the moon with distinctively human qualities. The moon cannot be cordless and some would also argue that it cannot be traveling. Therefore the vehicle is cordless. This tenor describes the moon, the light in the darkness. It moves forward without any restraints unlike the kite. It is a freeing experience. It is time to let go and move toward death. Finally death and the acceptance of it provides a person with purity. Often with death comes more fame. You die but not without leaving memories and worthiness behind. You become completely pure and important through your legacy.   Ã‚  Ã‚  Ã‚  Ã‚  Leonard Cohen illustrates some incredibly deep and powerful perspectives on life in this poem. He makes clear connections between his metaphors and the overall theme of the poem. Each tenor represents another metaphor that is open to scrutinizing interpretation. The theme of life and living is a powerful one. Cohen has provided effective examples of tenors within the text of a profound poem.

Macbeth the Play

Throughout the play Macbeth and Lady Macbeth together demonstrate how ambition can turn a loyal soldier into a bloodthirsty murderer with his scheming and devious wife turning weak and disturbed as ambition slowly destroys her. Macbeth’s ambition to become king of Scotland turn’s him independent and ruthless. â€Å"The dead butcher and fiend-like queen†, is an accurate description as this is all they amount to. At the start of the play Macbeth is a loyal soldier returning from the civil war. The witches tell Macbeth that he will become Thane of Glamis, Thane of Cawdor and King of Scotland.The witch’s prophecies make Macbeth ambitious and tap into pre-existing ambition. Macbeth believes these prophecies as the first of his prophecies has been fulfilled. Afterwards the second prophecy is carried out. Immediately Macbeth thinks of murdering King Duncan so the third of his prophecies will be fulfilled even though he is horrified by the idea. Lady Macbethâ€⠄¢s greed makes her determined the third prophecy will come true. But believes Macbeth is not capable of murdering Duncan but will provoke him. When Lady Macbeth hears the news that that Duncan is coming to visit she believes it is the ideal opportunity to kill Duncan.Lady Macbeth calls on the spirits of darkness and evil to replace her nurturing and feminine qualities with remorseless cruelty. Macbeth is appalled of the thought of killing his king and can think of many reasons for not going ahead with the murder. So Lady Macbeth manipulates him by accusing him of being a coward and unmanly, until he agrees to proceed with the murder. Lady Macbeth presents her plan that when Duncan’s servants are asleep, he will enter Duncan’s chamber and kill him. Macbeth carries out this murder so the third prophecies will be fulfilled.It is demonstrated that ambition and greed can influence Macbeth and Lady Macbeth to commit murder and therefore the description, â€Å"The dead butc her and fiend-like queen,† is accurate as this is all they amount to. Macbeth’s ambition to become king was a large sacrifice as he becomes a blood-thirsty murderer. After killing the king he begins to turn into the â€Å"dead butcher†. As Macbeth’s ambition leads Macbeth into committing these horrendous murders. After killing the king he also kills Duncan’s servants to make it seem as if they killed the king and so no one would suspect him. â€Å"O, yet I do repent me of my fury, that I did kill them.†Act 2, Scene 3 (page 95) Macbeth claiming he killed the servants in rage however he killed them as they would of suspected him. Macbeth continues his heartless murders by hiring murderers to kill Banquo and Fleance as Macbeth becomes obsessed with Banquo’s prophecies that he will be, â€Å"Lesser than Macbeth, and greater. † Macbeth convinces the murderers that Banquo is there enemy and deserves to be killed. Macbeth promises the murderers that he will remove them from the general list and place them on the special list to move them from a low class of society and put them in the high class.Macbeth’s ambition to become king was a large sacrifice as he becomes a blood-thirsty murderer. After killing the king he begins to turn into the â€Å"dead butcher†. As Macbeth’s ambition leads Macbeth into committing these horrendous murders. After killing the king he also kills Duncan’s servants to make it seem as if they killed the king and so no one would suspect him. â€Å"O, yet I do repent me of my fury, that I did kill them. † Act 2, Scene 3 (page 95) Macbeth claiming he killed the servants in rage however he killed them as they would of suspected him.Macbeth continues his heartless murders by hiring murderers to kill Banquo and Fleance as Macbeth becomes obsessed with Banquo’s prophecies that he will be, â€Å"Lesser than Macbeth, and greater. † Macbeth convinces the murderers that Banquo is there enemy and deserves to be killed. Machbeth promises the murderers that he will remove them from the general list and place them on the special list to move them from a low class of society and put them in the high class. Macbeth finally kills Macduffs family to get revenge as Macduff portrayed him by refusing to attend his banquet and leaving for England to seek military assistance to attack Macbeth.It is demonstrated that after killing the King Macbeth begins turning into a bloodthirsty murderer and therefore the description â€Å"the dead butcher† is an accurate description as this is all Macbeth amounts to. At the start of the play Lady Macbeth is devious and scheming, as she is determined Macbeth will become King but in the end Lady Macbeth is destroyed by ambition and greed as it turns her insane. Initiatly Lady Macbeth spurs Macbeth on as she believes Macbeth is not capable of murdering Duncan. Lady Macbeth plans Duncan’s murder and manipulates Macbeth into going ahead with it.However after the murder of Duncan Lady Macbeth becomes weak. Lady Macbeth is suffering from troubled sleep, nightmares, and loss of appetite. But hides the distress. But later on her guilt overpowers her and a doctor is employed to watch her. Lady Macbeth is hugely disturbed as she obsessed with washing her hands to clean the blood she sees and smells, speaks vivid recreations of the murders, sleepwalks and talks in her sleep. â€Å"This disease is beyond my practice. † Act 5, Scene 1 (page 213) The doctor cannot cure the mental disturbance and warns them he suspects she is suicidal.Lady Macbeth later on dies. It is demonstrated that ambition and greed turned Lady Macbeth from scheming and devious to weak and disturbed. The description â€Å"fiend-like queen,† is an accurate description as this is all Lady Macbeth amounts to. After the king’s murder Macbeth begins on the path to becoming the â€Å"dead butcherâ € . Ambition has turned him independent and ruthless. But this ambition destroys him as he becomes paranoid about anyone overthrowing him. Macbeth makes plans independently for Banquo and Fleance to be murdered and refuses to give Lady Macbeth any details.†Be innocent of the knowledge, dearest chuck, till thou appalled the deed.† Act 3, Scene 2 (page 129) Macbeth sends a third murderer to kill Banquo and Fleance as he no longer trusts anyone. Macbeth goes back to see the witches independently and demands that they answer his questions. The witches tell Macbeth to beware of Macduff; that he will not be killed of anyone born of woman; and he will be defeated only when the trees of Birnam wood move towards his castle. Macbeth decides to murder Macduff’s family to seek revenge as he has left for England.However soon after he becomes paranoid about anyone defeating him but the prophecies reassure him although everyone has deserted him. Macbeth’s arrogance con vinces him that he cannot be killed. However in the end Macduff explains that technically he was not born a woman as he was a caesarian. Macbeth realizes he is defeated but shows bravery as he refuses to surrender and will fight to his death. â€Å"Lay on, Macduff; And damn’d be him that first cries ‘Hold, enough! † Act 5, Scene 8 (page 249) It is demonstrated that Macbeth’s ambition to become king of Scotland turn’s him independent and ruthless.But this ambition destroys him as he becomes paranoid about anyone overthrowing him. â€Å"The dead butcher†, is an accurate description as this is all he amounts to. Together the Macbeth’s illustrate how ambition can a loyal soldier into a bloodthirsty murderer with his scheming and devious wife turning weak and disturbed as ambition slowly destroys her. Macbeth’s ambition to become king of Scotland turn’s him independent and ruthless. But in the end it is ambition destroys them both. â€Å"The dead butcher and fiend-like queen†, is an accurate description of Macbeth and Lady Macbeth as this is all they ever amount to.

Where Whales Have Hair and How Its Used

Whales are mammals, and one of the characteristics common to all mammals is the presence of hair. We all know that whales arent furry creatures, so where do whales have hair? Whales Do Have Hair While its not immediately obvious, whales do have hair.  There are over 80 species of whales, and hair is only visible in some of these species. In some adult whales, you cant see hair at all, as some species only have hair when they are fetuses in the womb. Where Is Hair in Whales? First, lets look at baleen whales. Most of the baleen  whales have hair follicles if not visible hair. The location of the hair follicles is similar to the whiskers in terrestrial mammals. They are found along the jawline on the upper and lower jaw, on the chin, along the midline on top of the head, and sometimes along the blowhole. Baleen whales known to have hair follicles as adults include  humpback, fin, sei,  right,  and  bowhead  whales. Depending on the species, the whale may have 30 to 100 hairs, and there are usually more on the upper jaw than the lower jaw.   Of these species, the hair follicles are probably most visible in the humpback whale, which  has golf ball-sized bumps on its head, called tubercles, which house the hairs. Within each of these bumps, called tubercles, there is a hair follicle. The toothed whales, or odontocetes, are a different story. Most of these whales lose their hair shortly after birth. Before theyre born, they have some hairs on the sides of their rostrum or snout. One species, though, has visible hairs as an adult. This is the  Amazon river dolphin or boto, which has stiff hairs on its beak. These hairs are thought to add to the botos ability to find food on muddy lake and river bottoms. If you want to get technical, this whale doesnt quite count as marine life, as it lives in fresh water. Hairlike Baleen Baleen whales  also have hairlike structures in their mouth called baleen, which is made of keratin, a protein that is also found in hair and nails. How Is the Hair Used? Whales have blubber to keep them warm, so they dont need fur coats. Having hairless bodies also helps whales release heat more easily into the water when they need to. So, why do they need hair? Scientists have several theories on the purpose of the hair. Since there are lots of nerves in and around the hair follicles, they are likely used to sense something. What that is, we dont know. Perhaps they can use them to sense prey - some scientists have suggested that prey may brush against the hairs, and allow the whale to determine when it has found a high enough prey density to begin feeding (if enough fish bump against the hairs it must be time to open up and eat). Some think that the hairs may be used to detect changes in water currents or turbulence. It is also thought that the hairs may have a social function, perhaps being used in social situations, by calves communicating a need to nurse, or perhaps in sexual situations. Sources Goldbogen, J.A., Calambokidis, J., Croll, D.A., Harvey, J.T., Newton, K.M., Oleson, E.M., Schorr, G., and R.E. Shadwick. 2008. Foraging behavior of humpback whales: kinematic and respiratory patterns suggest a high cost for a lunge. J Exp Biol 211, 3712-3719.Mead, J.G. and J.P. Gold. 2002. Whales and Dolphins in Question. Smithsonian Institution Press. 200pp.Mercado, E. 2014. Tubercles: What Sense Is There? Aquatic Mammals (Online).Reidenberg, J.S. and J.T. Laitman. 2002. Prenatal Development in Cetaceans.  In Perrin, W.F., Wursig, B. and J.G.M. Thewissen. Encyclopedia of Marine Mammals. Academic Press. 1414pp.Yochem, P.K. and B.S. Stewart. 2002. Hair and Fur.  In  Perrin, W.F., Wursig, B. and J.G.M. Thewissen. Encyclopedia of Marine Mammals. Academic Press. 1414pp.