Dry Ice Composition and Uses

Dry Ice Composition and Uses Dry ice is the general term for solid carbon dioxide (CO), coined in 1925 by Long Island-based Prest Air Devices. Though originally a trademarked term, dry ice has become the most common way of referring to carbon dioxide in its solid, or frozen, state. How Is Dry Ice Manufactured? Carbon dioxide is frozen by compressing carbon dioxide gas to a high pressure to create dry ice. When it is released, as liquid carbon dioxide, it quickly expands and evaporates, cooling some of the carbon dioxide down to the freezing point (-109.3 F or -78.5 C) so that it becomes solid snow. This solid can be compressed together into blocks, pellets, and other forms. Such dry ice snow also forms on the nozzle of a carbon dioxide fire extinguisher when it is used. Special Properties of Dry Ice Under normal atmospheric pressure, dry ice undergoes the process of sublimation, transitioning directly from solid to gaseous form. In general, at room temperature and normal pressure, it sublimates at a rate of 5 to 10 pounds every 24 hours. Because of the very low temperature of dry ice, it is used for refrigeration. Packing frozen food in dry ice allows it to remain frozen without the mess that would be involved with other cooling methods, such as water from melted ice. Several Uses of Dry Ice Cooling materials- food, biological samples, perishable items, computer components, etc.Dry ice fog (see below)Cloud seeding to increase precipitation from existing clouds or decreasing cloud thicknessTiny pellets can be shot at surfaces to clean them, similar to sanding ... since it sublimates, the benefit is less residue to clean upVarious other industrial uses Dry Ice Fog One of the most popular uses of dry ice is in special effects, to create fog and smoke. When combined with water, it sublimates into a cold mixture of carbon dioxide and humid air, which causes condensation of water vapor in the air, forming fog. Warm water speeds up the process of sublimation, producing more dramatic fog effects. Such devices can be used to make a smoke machine, although simplified versions of this could be created by putting dry ice in water and using fans on low settings. Safety Instructions Do not taste, eat or swallow! Dry ice is very cold and can damage your body.Wear heavy, insulated gloves. Since dry ice is cold, it can damage even your skin, giving you frostbite.Do not store in sealed container. Because dry ice constantly sublimates into carbon dioxide gas, storing it in a sealed container will cause pressure to build up. If it builds up enough, the container could explode.Use only in ventilated space. In a poorly ventilated area, the build up of carbon dioxide could create a suffocation hazard. This is a great danger when transporting the dry ice in a vehicle.Carbon dioxide is heavier than air. It will sink to the floor. Keep this in mind when thinking about how to make the space ventilated. Obtaining Dry Ice You can buy dry ice at most grocery stores. You have to ask for it, though. Sometimes there might be an age requirement on buying dry ice, requiring someone age 18 or over. Edited by Anne Marie Helmenstine, Ph.D.

Sentence Flow

Sentence Flow Sentence Flow Sentence Flow By Maeve Maddox David writes: I was wondering if you could share your thoughts on how to flow from sentence to sentence. I feel mine can be a bit jumpy as I tell the story. Much is written about â€Å"transition sentences,† that is, sentences that bridge paragraphs, but that’s not what this question is about. This question is about what a writer can do to avoid writing paragraphs that all progress to a beat of dumpty-dumpty-dump. Two things contribute to the flow of sentences within a paragraph: 1. sentence length 2. logical progression of thought In browsing my shelves for examples, I realized that some very popular writers don’t seem to share David’s concern regarding â€Å"jumpy† narration. Here’s a typical paragraph from Dan Brown’s The Da Vinci Code: Langdon and Sophie stepped into another world. The small room before them looked like a lavish sitting room at a fine hotel. Gone were the metal and rivets, replaced with oriental carpets, dark oak furniture, and cushioned chairs. On the broad desk in the middle of the room, two crystal glasses sat beside an opened bottle of Perrier, its bubbles still fizzing. A pewter pot of coffee steamed beside it. Not a complex sentence in sight. It doesn’t seem to matter if Brown is being reflective or describing action. Most of his sentences are simple or compound. Here and there the reader comes across a noun clause introduced by that, or a an adverb clause introduced by as or as if. Mostly it’s dumpty-dumpty-dump. Yes, Dan Brown is a wildly successful writer and I’m happy for him. His gift, however, is story-telling, not writing style. Here are two examples from a novel by a writer who is both an effective story-teller and a fine stylist. The first is a paragraph in which the narrator is reflecting on his life. He is attending the opera with his employer. I suppose I had once aspired to come here and walk among these beautiful, elegant people as one of their own, but that had been long ago, before all my dreams had been dashed like porcelain on paving stones. Now that I was finally here, I felt all the more like a Welsh collier’s brat, as if I were still twelve, nose running, and starting to outgrow my brother’s cast-offs. I was in the right place at the wrong time. Such was the refrain of my life. Some Danger Involved by Will Thomas The first sentence is long and leisurely, suggesting reflection. It contains no fewer than four clauses and numerous phrases. The second sentence has multiple clauses and phrases, but the last two are simple sentences, brusquely bringing the introspection back to the present moment. The second example is from an action paragraph in which the narrator is about to be murdered. The cross spun in a circle, and when it stopped, a pistol was clapped to my head. It was my own revolver. I recognized the filed-down sight. I closed my eyes and felt surprisingly at ease. I was ready to die now. I gave it all over. At that point, I would have preferred a bullet to slow death. Ibid. The first sentence has three clauses joined by the most commonplace conjunctions and and when. The loosely joined clauses suggest a spinning motion. The next two sentences are simple and staccato. Short sentences take the reader along rapidly. They convey the breathlessness felt by the man in danger. The next sentence has two clauses, but they are short and, again, joined by the nearly invisible and. The next three sentences are simple. With the length of the sentences the writer has conveyed both the fear and resignation felt by the narrator. The writer striving for a pleasantly flowing style will vary sentence length and kind, crafting length to thought. Here are some joining words with which to introduce subordinate clauses. Subordinate conjunctions after, although, as, as if, as long as, as much as, as soon as, as though, because, before, even if, even though, how, if, inasmuch, in order that, lest, now, provided (that),   since, so that, than, that, though, till, unless, until, when, whenever, where, wherever, while, Conjunctive adverbs accordingly, also, anyway, again, besides, certainly, consequently, contrarily, finally, further, furthermore, elsewhere, hence, henceforth, however, in contrast, incidentally, indeed, instead, likewise, meanwhile, moreover, namely, nevertheless, next, nonetheless, now, otherwise, rather, similarly, so, subsequently, still, that is, then, thereafter, therefore, thus, undoubtedly, yet Want to improve your English in five minutes a day? Get a subscription and start receiving our writing tips and exercises daily! Keep learning! Browse the Fiction Writing category, check our popular posts, or choose a related post below:Good At, Good In, and Good With20 Words Meaning "Being or Existing in the Past"Epidemic vs. Pandemic vs. Endemic

How to Change the Oil in Your Car Essay Example | Topics and Well Written Essays - 1000 words

How to Change the Oil in Your Car - Essay Example Don't be scared, you don't need any high tech gadgets or tools to get the job done. Aside from the oil wrench, you probably already have all the other tools lying around in your garage. Just like with any other task, getting the right tools together is the first step towards successfully completing the job. The tools you will need (Memmer How to Change Your Oil...) include a combination wrench set (closed and open-ended), oil filter wrench, oil catch basin, a zip lock bag and a funnel. For the oil change itself you will need, a new oil filter and 4-5 quarts of oil (refer to your car manual for for grade and number of quarts). Any commercial oil such as Valvoline and Castrol will do the job. Since this work will require you to get down and dirty, you should wear pre-soiled work clothes in case any oil dropping come down on you. Surgical gloves on your hands for better grip on the oil plug and old oil filter are advised for safety reasons but not really necessary. As a further safety p recaution, have a jack and 4 jack stands handy. After getting all of the necessary tools and materials together, you are now ready to begin the change oil process. Now remember, hot oil will drain faster out of your car (eHow How to Change Your Motor Oil). ... Instead, you should jack up the car and place a stand underneath each of the 4 vital weight points (refer to car manual) in order to secure the car above you. Carefully position yourself under the car, making sure to protect yourself against any accidental oil drippings. Now you are ready to locate the oil drain plug. Carefully place the oil catch basin under the drain plug before unscrewing in order to insure that the old oil will not drain into the street or be absorbed into the soil. Now would be the best time to wear the surgical gloves if you want to because the first rush of oil out of that pan is going to be scalding hot. Remember to clean the drain plug then set it aside to replug the hole after the drain is complete. Check the plug for any sign of wear and tear. Replace the drain plug if necessary then replug the oil drain hole. Replugging the drain hole is best done by hand in order to insure that cross threading does not occur. Be sure not to over tighten the plug once you use the wrench to tighten it. Now take a breath, we are almost done. We've got only 3 more important steps to go. In order to fully drain the old oil from the car, you will have to remove and replace the old oil filter located somewhere underneath the car. It is usually positioned somewhere on the side of the engine. You will need the oil wrench to loosen and remove the old filter. Expect the remaining old oil to spurt out from this area so make sure that the oil catch basin is properly positioned to catch the oil. Since an incorrectly attached oil filter can lead to costlier repairs later on, make sure to inspect this area of the motor thoroughly. Using an old but clean

Guide to Mental Health Self-Help Support Group Experience Essay

Guide to Mental Health Self-Help Support Group Experience - Essay Example They touch the family, friends, and caregivers as well. How the symptoms are managed depends on a great degree on the amount of information provided by the mental health professional. In addition, the cultural perspective will often dictate the level of shame and stigma that must be overcome and how treatment will be provided. The medical model seeks to reinforce the importance of lifelong abstinence by encouraging the patient to attend counseling and twelve step groups. These support groups are frequently used as adjunctive interventions and are philosophically interwoven into many social and medical model treatment programs. Alcoholic Anonymous (AA) was founded in the 1930s by Bill Wilson and Dr. Bob Smith, two alcoholics who discovered that they could maintain their sobriety by helping other alcoholics. AA is often referred to as the most effective and widely utilized treatment for addictions (Royce, 1981) and this is the primary reason why our group chose this mental health support group. Aside from this, it is now an international self-help fellowship which offers support to all people who want to quit drinking. Narcotics Anonymous, Cocaine Anonymous and other anonymous support groups are structured on the AA model and utilizes its â€Å"Twelve Steps and Twelve Traditions† as the basis of their recovery program. The fellowship and principles offered at meetings encourage individuals to remain sober by taking life â€Å"one day at a time† and to work toward spiritual development and character change. Alcoholics Anonymous currently has more than one million members in the United States with 52,000 groups while they have almost 100,000 members in Canada with 45,000 groups. They also have members outside US and Canada averaging 730,000 distributed in more than 45,000 groups. They have a total of 2,082,980 members and 105,294 groups in their organization including the loners and members in

Eating Disorders and the Media Essay -- anorexia nervosa and bulimia n

Eating Disorders and the Media Doctors annually diagnose millions of Americans with eating disorders. Of those diagnosed, ninety percent are women. Most of these women have one of the two most common types of eating disorders: anorexia nervosa and bulimia nervosa (National Council on Eating Disorders, 2004). People with anorexia nervosa experience heart muscle shrinkage along with slow and irregular heartbeats and eventually heart failure. Along with their heart, their kidney, digestive system and muscles often fail them. The mortality rate of anorexia is twenty percent, which is the highest of any psychiatric disorder. People with bulimia nervosa experience erosion of their teeth, irritation and rips in their throat, stomach, and esophagus, and develop a dependency on laxatives. These symptoms occur along with the same symptoms that anorexics suffer. One third of people with eating disorders never fully recover. Instead, according to eating disorder researchers, they experience â€Å"repeating wavelike patterns of disease and recovery [and] seldom return to a state of normal eating† (D'Abundo & Chally, 2004; National Council on Eating Disorders, 2004). How can a female choose to force her body into a state of living decay? In this paper, I have discussed the complex interaction of media and young women. I have also proposed solutions that might help activists interested in lessening the chances of girls developing eating disorders. In the literature review, I focus on the scholarly work conducted to understand how consumption of certain media interacts with low self-esteem to cause young females to want to fit the societal norm of being thin. This drive for thinness in young women can cause eating disorders. Th... ...urrent Directions in Psychological Science, 10(5), 181-183. Thomsen, S. (2002). Health and Beauty Magazine Reading and Body Shape Concerns Among a Group of College Women. Journalism and Mass Communication Quarterly, (79) 4, 988-1007. Tyner, T. (1992). Implementation: The Next Step. Strategies for Media Literacy Quarterly. Walsh, B. (2004). A Plea for Expanded Media Literacy. Retrieved on December 8, 2004, from http://interact.uoregon.edu/MediaLit/mlr/readings/articles/kubey.html. Wade, T. Davidson, S. & O’Dea, J. (2002). A Preliminary Controlled Evaluation of a School-Based Media Literacy Program and Self-Esteem Program for Reducing Eating Disorder Risk Factors. International Journal of Eating Disorders, 371 – 383. Zajonc, R. (2001). Mere Exposure: A gateway to the Subliminal. Current Directions in Psychological Science, 10(6), 224-228.

Corporate Re-initiation as a Change-Management Program Essay

Corporate organizations have adopted a number of knighthood-based investitures as methods to infuse the delicate but significant management of change among their old/senior managers.   A number of published business reviews state that the Japanese and Danish shipping companies are known for their unique change management techniques through â€Å"initiations† or corporate â€Å"baptisms of fire†, where the old-school managers are guaranteed to taste a military-style right of passage in these companies that would comprise all phases of the change process from shock to integration (Recklies). It is true enough that change management through retraining or managerial initiation is a tried and tested military method of producing good commanders for facing an ever-changing brutal field, and the design of such change management initiations has shaped the right of passage for their civilian corporate counterparts.   Essentially, a good initiation must be anchored on the scientifically-established phases of change, to provide the mental and strategic framework for leadership renewal.   One can only contemplate on the complexity of designing an effective initiation process and their phases on changing the character of the trainee into a newly refreshed manager. Departmental/Field Rotation Since experience is thought of as the best teacher, re-initiation should be conducted mostly on the field.   The manager-trainee must spend one month working in each department/division of the company.   The job for Week One must involve the lowest and dirtiest chores to provide the shock or surprise therapy.   For our shipping company example, s/he can man the forklift, move crates/boxes etc., to erase his /her alienation with the lowest level of employees and learn to confront unexpected situations on the ground level.    Week Two must involve more technical tasks, such as ship communications and radio coordination.   Then the trainee must progress up the department’s ladder in Week Three, manning a team (or teams) in the department to achieve the rational understanding and emotional acceptance phases, for it is in these ground teams that the usual crises spur up.   Then on Week Four, the re-trainee will supervise the whole department. For each first Friday of the month, the trainee must answer an exam issued by the head of the department to evaluate his/her performance and document his/her character change for the past month.   After this, the trainee must then be rotated to another department, starting from the ground-up again, then another exam, until s/he comes across all departments to implement the exercising and learning and phase, where the manager tries new behaviors and processes while adapting totally new departmental environments This program sounds very exciting for a multinational shipping company with operations (and offices) across the world, requiring the trainee(s) to travel and spend time in both functional and geographical field departments.   For optimum learning experience for the future manager, this departmental rotation must be done within 12 months, then a comprehensive exam to asses the trainee’s management horizon and newly-learned expertise.   But the designed program must not end in departmental management, for there is still the higher-level management to teach. High-level Management Now that our trainee had valuable experience in the departments and field offices, s/he should master the main office and its worldwide coordinating patterns/styles.   S/he could be in charge of a section of the coordinating network of the logistics and sea transportation form, while attending mandatory classes on advanced, MBA-level economics, customs and trade management during the weekends, all expenses paid by the company, this conducive to the realization phase of change where new experiences and insights are encountered and related into company policy and strategy.   This high-level management part should go on for another year, to ensure that our trainee can relate his/her departmental/field experience to the theoretical/conceptual nature of top-level management, thus achieving the integration phase. At the end of this program, the manager is expected to have a healthy mix of experiencing the harsh field offices/departments and the stressful solitude of the main office.   The main purpose of mixing, creating a blend of experiences is to build upon the manager an ability to empathize on real business challenges and real-life operations, that in case problems arise, our trainee can confidently resolve new and inevitable crises, then shape company policy for success.   In designing a training program, one must achieve a character change that is holistic and balanced. Reference The Maersk Group. (2007). A Global Way to Work. Retrieved February 2, 2008, from http://www.mise.edu/. Recklies, O. (no date). Managing Change: Definition and Phases in Change Processes. Retrieved February 2, 2008, from http://www.themanager.org/Strategy/Change_Phases.htm.

The Colonization Of The Middle East - 1642 Words

Many of the problems in the Middle East today are a direct result of actions undertaken in the region s colonial past. I will argue that both imperialist ineptitude, deliberate meddling and outright deceit by colonial powers have sown seeds of distrust that linger in the Middle East today towards the West. I will claim that artificial boundaries, government structures and societal schisms created in colonial times have entrenched animosities and created internal structural instabilities in the area that are still being resolved. The imposition of Israel into Palestine, I will argue, remains an unresolved product of colonial rule. I will discuss how the discovery of oil and the regions importance as a trade route caused the World Powers to remain engaged in the area and oppressive in their demeanour. Finally I will argue that perhaps the greatest ongoing legacy of colonialism in the Middle east is an imperialist attitude by the west which continues to this day. Different regions in the Middle East have different experienced different levels of colonialism. Prior to the First World War some regions of the Ottoman Empire were already under the influence of European countries (Owen 2006, p. 23). Between the first and second world wars most of the empire was formally divided between, and under the control of, Britain and France (Owen 2006, p. 25) and even after the second world war European influence lingered. Cole and Kandiyoti describe these periods as informal imperialismShow MoreRelatedThe Colonization Of Egypt During The Middle East1460 Words   |  6 Pagesthe Arab world and the Middle East. The 1800 s were known as the colonial era, and most of the occupation in the Middle East took place during that era. While we are supposedly living in the days of post colonialism†, there are still signs of colonization evident in the Arab world today. Throughout the readings of Fatima Mernissi and Ahdaf Soueif, the reader comes across the th eme of colonization. The British colonization of Egypt is very similar to the French colonization of Morocco during theRead MoreThe Common Elements Of Colonization Movements Of South Asia, The Middle East, And Africa780 Words   |  4 Pages1. Discuss the common elements of colonization movements in south Asia, the Middle East, and Africa. Nearly all nationalist movements were led by Western-educated elites who often had previous experience in the colonial administration. Also, there often was a fascinating leader like Gandhi or Nkrumah. With the exception of the settler colonies and in the Middle East, decolonization usually was achieved by peaceful confrontation on the model of India. In settler territories, European populations stoppedRead MoreWhy Did The Muslim World?1162 Words   |  5 PagesEuropean powers colonized the New World. 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