Boil Water at Room Temperature

You can boil water at room temperature without heating it. This is because boiling is about pressure, not just temperature. Heres an easy way to see this for yourself. Simple Materials watersyringe You can get a syringe at any pharmacy or lab. You dont need the needle, so its  safe project, even for kids. How to Boil Water Without Heating It Use the plunger to pull up a bit of water into the syringe. Dont fill it -- you need airspace in order for this to work. You just need enough water that you can observe it.Next, you need to seal the bottom of the syringe so that it wont be able to suck up more air or water. You can put your fingertip over the opening, seal it with a cap (if one came with the syringe), or press a piece of plastic against the hole.Now youll boil the water. All you need to do is pull back as quickly as you can on the syringe plunger. It may take a couple of tries to perfect the technique, so you can keep the syringe still enough to watch the water. See it boil? How It Works The boiling point of water or any other liquid depends on vapor pressure. As you lower the pressure, the boiling point of the water drops. You can see this if you compare the boiling point of water at sea level with the boiling point of water on a mountain. The water on the mountain boils at a lower temperature, which is why you see high-altitude instructions on baking recipes! When you pull back on the plunger, you increase the amount of volume inside the syringe. However, the contents of the syringe cant change because you have sealed it. The air inside the tube acts as gases do and the molecules spread out to fill the whole space. The atmospheric pressure inside the syringe drops, creating a partial vacuum. The vapor pressure of the water becomes high enough compared to the atmospheric pressure that the water molecules can easily pass from the liquid phase into the vapor phase. This is boiling. Compare it with the normal boiling point of water. Pretty cool. Any time you lower the pressure around a liquid, you lower its boiling point. If you increase the pressure, you raise the boiling point. The relationship is not linear, so you would need to consult a phase diagram to predict how great the effect of a pressure change would be.

Globalization The North America, By Thomas Friedman Essay

Throughout history, the progressions of mankind has given way to a perpetually globalizing world. Globalization, the â€Å"process of interaction and integration among peoples of different nations, has strengthened human ties while our race has formed societies in every corner of the globe. As our world becomes more interconnected, the resulting blend of cultures has led numerous societal features to be shared between peoples, blurring cultural division lines. Globalization’s tying binds may frustrate many modern travelers seeking unique and special travel experiences due to the standardization of destinations resulting from increasingly cozy international social relations, but continued and extensive human travel has demonstrated that the essential human urge to move is a product of our search for fulfillment in what is unfamiliar and will not be suppressed by global interconnection. The origin of modern globalization can be traced to Columbus’ discovery of the North America, as argued by Thomas Friedman. European exploration during the Age of Discovery invited the rise of extensive European naval trade routes that invited massive exchange of European, African, and American cultures, material resources, and biological property in the form of diseases and mestizo populations from offspring between clashing ethnicities. Triangular trade opened the door for the introduction of foreign foods, plants, and animals into foreign societies. Establishment of European colonies meant thatShow MoreRelatedThe World Is Flat by Thomas Friedman931 Words   |  4 PagesFlat, by Thomas Friedman draws attention to some very good points concerning globalization and the world economy today. Friedman emphasizes the status of America today in relation to the other countries of the world. 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Basement Free Essays

3 – basement 3 – Basement 1 Quick Revision 1. 1 Problems arising from basement construction a. Excavation method. We will write a custom essay sample on Basement or any similar topic only for you Order Now b. Surface and ground water control c. Lateral stability of basement excavation. d. Stability of adjoining building. 1. 2 Ground water control – dewatering a. Open Sump Pumping b. Wellpoint System. c. Shallow-Bored Well System d. Deep-Bored Well System 1. 3 Basement Excavation a. Open excavation b. Sheet pile cofferdam Supported with raking struts Supported with struts and walings Supported with ground anchors Ground support and ground water control for deep excavation Cut off wallings: c. Thin grouted diaphrage d. Mixed in place wall e. Ground treatment f. Circular cofferdam g. Diaphrage wall 1/11 3 – basement 2. Cut-off wallings 2. 1 Thin grouted diaphragm A series of touching universal beams or columns are driven into the ground to the required depth. A grout injection pipe is fixed to the web the section and this is connected to a group pump at the ground. As the sections are withdrawn the void created is filled with cement grout to form the thin membrane. This is a non-structural wall and services only as a cut-off wall. It is uitable subsoil of silt, sand and gravel. 2. 2 Thin grouted diaphragm (Source: R. Chudley) Mixed-in-place wall A hollow churn drill is drilled into the ground. Intrusion grout is pumped through the hollow kelly bar during the drilling operation. When the required depth is reached, the auger rotation is reversed and withdrawn while grout injection continues. The grout is thus mixed with the existing soil to form a mixed-in-place pile. The above process is repeated with the piles being cast against each other until the whole wall is formed. Mixed-in-place pile (Source: Jufri Wellmen) /11 3 – basement 2. 3 Ground treatment The major disadvantage of pumping is causing settlement of surrounding ground. In urban areas, settlement would serious affect the stability of adjacent properties. In this situation, grouting method can be used to control ground water. The basic method is to inject the soil or rock with fluids which, on setting, seal or reduce the permeability of the material. There are various types of grouts. The choice of grouts, the pattern and spacing of the injection pipes will depend upon the particle sizes of the soil or the size of fissures in the rock. Cement Grouting (Source: R. Chudley) 2. 3. 1 Cement grouting Cement grout is suitable for injecting into coarse materials which have a high permeability. This method not only can form an impermeable barrier to ground water but also solidify loose soils which prevents from collapsing during excavation. It is usual to commence grouting with a batch of thin grout and then to increase the viscosity of the grout as the process continues, by reducing the water-cement ratio. The grout used may be composed of neat cement grout, or a mixture of cement and 3/11 3 – basement sand in the ratio of 1 : 4. The adding of sand reduces the cost of material but it also reduces the workability. On the other hand, pulverized fuel ash (PFA) may be used to replace part of the cement (up to 50%) to reduce the cost of the material. The spherical particle shape of PFA improves the flow quality of the grout without reducing its strength. 2. 3. 2 Bentonite grouting Bentonite grouting is used in ground conditions where the particles of the soil are too small for cement grouting. While bentonite grout adds little strength to the soil, it has a high resistance to water flow and therefore produces an excellent barrier. Bentonite is produced from montmorillionite clay, which has thixotropic properties: when it coagulates it forms a gel, and if mixed with certain additives, such as Portland cement or soluble silicates, the barrier formed will be permanent. 2. 3. 3 Chemical grouting There are two main processes of chemical grouting: ‘one-shot’ and ‘two shot’. In the ‘two-shot’ process, pipes are driven into the ground at about 600 mm centres, and the first chemical, normally sodium silicate, is injected. This is followed immediately by the injection of the second chemical, calcium chloride. The reaction between the two chemicals is immediate, resulting in a tough, insoluble ‘silica-gel’. The process gives considerable strength to the soil and greatly reduces its permeability. Two-shot process for chemical grouting 4/11 3 – basement The ‘two-shot’ process has been largely superseded by the ‘one-shot’ process, which consists of mixing together prior to injection two chemicals whose gel time can be sufficiently delayed to allow full penetration of the soil before gel occurs. The extent of the delay can be accurately controlled by varying the proportions of the two chemicals. The extra time available for placing this grout allows wider spacing of the boreholes. 4. 2. 6 Circular cofferdam Steel sheet pile cofferdams may be arranged in circular shape in plan. Circular cofferdams may be supported with ring walings. The walings are subject to tangential thrust and act as a continuous arch. Thus transverse struts are not required. Large diameter circular cofferdams may be formed of concrete diaphragm wall and reinforced with ring concrete beam. The advantage of this method is that it provides a clear excavation un-hampered by struts. However, the method is restricted to circular shape. Circular cofferdam support with ring walings Basement construction of IFC 5/11 3 – basement 5 Diaphragm Walls Diaphragm walling describes the construction of continuous concrete walls into the ground. The process, sometimes called the slurry trench method, involves the excavation of a narrow trench to the required depth which supported with bentonite slurry. The trench is then filled with concrete to form the wall. Construction of diaphragm wall 5. 1 Advantages of using diaphragm walls for basement construction 1. The process of constructing the wall is relatively quiet and has little vibration. . The wall can be constructed to a great depth. 3. The wall provides temporary ground supports during excavation hence expensive steelwork is eliminated or minimized. 4. The wall provides a good water cut-off; no dewatering is required and hence has little effects on adjacent structure. 5. The wall serves both as external wall for the basement and the foundation for the superstructure. 6. For deep basement, diaphragm walling is more economical than using steel sheeting cofferdam. 6/11 3 – basement 5. 2 Method of construction of concrete diaphragm wall 1. A perimeter trench, 1 to 1. m deep and with a width equal to the wall thickness plus 300 mm is excavated. 2. The trench is lined on both sides with 150 mm thick in-situ concrete. (The linings provide a guide for the grab and protect the top of the excavation from collapse. ) 3. The wall is divided into to panels. The width of each panel is about 4. 5 to 7 m. The sequence of construction for the panels is in an alternatively way. That is, an intermediate panel is excavated after panels on its both sides have been cast. 4. The trench is then filled with bentonite slurry from a large storage tank before excavation. Excavation is done by a grab. During excavation, it is important to maintain the slurry level at about 0. 5 m below the top of the trench. (The function of the bentonite is to prevent the ingress of water and soil into the trench. ) Excavation is continued until the founding is reached. 5. Stop end pipes of diameter equal the wall thickness are placed at both ends of the panel. A reinforcement cage is lowered through the bentonite and panel is cast with tremie concrete. The displaced bentonite is recovered, strained to remove the soil particles and then stored for future use. 6. When the concrete has set, the stop end pipes are removed. Semi-circular sockets are formed which provide key for the adjacent panels. 7. Further panels of the diaphragm wall are then formed in a similar manner until the wall is completed. 5. 3 Precast Concrete Diaphragm Walls Diaphragm walls can also be formed with precast concrete panels. The construction sequence is: 1. A perimeter trench, lined on both sides with concrete walls, is prepared. 7/11 3 – basement 2. The trench is filled with bentonite slurry and excavated with a grab. During excavation, the slurry level is maintained at about 0. m below the top of the trench. Excavation is continued until the founding is reached. 3. Cement grout is introduced to the bottom of the trench with a spreader. The displaced bentonite is recovered, strained to remove the soil particles and then stored for future use. 4. Precast posts or panels are inserted into the trench to form the wall 5. When the grout has set, it seals the joints of the precast panels effectively, and the diaphragm wall is formed. Precast Concrete Diaphragm Wall Precast Concrete Diaphragm Wall (Source: R. Holmes) (Source: R. Holmes) 8/11 3 – basement 6 Soldier pile wall Since the wall of a basement must be watertight, if a soldier pile wall is used as a basement wall, the piles of the wall will be constructed to overlap with each other. This type of wall is also called secant pile wall. The overlapping is about 120 to 200 mm. It is cut by a hydraulic actuated casing fitted with a cutting ring at the lower end. The cutting must be done within one or two days after the concrete has been cast to prevent it become to hard. Secant pile wall Alternatively, the piles of the wall are cast contiguous. Boreholes are drill at the joints of the piles which cut the edges of the piles. The boreholes are then filled ith bentonite-cement grout to seal the joints. Secant pile wall (Source: R. Chudley) 9/11 3 – basement 7 Top-Down Basement Construction It is to construct the basement in the downward direction to the final levels of the basement. The sequence of work is as follows:1. Construct the permanent basement wall using diaphragm wall or soldier piles wa ll. 2. Construct bored piles with temporary steel casings as the foundation of the basement. The cut-off level of the piles is at the final basement level. 3. Place steel columns inside the steel casings of the bore piles from the foundation level up to the ground level. . Backfill the shafts with granular material to hold the steel columns. 5. Construct the ground floor slab supported on the steel columns and the diaphragm walls. (This slab provides a working platform for superstructure construction and acts as the lateral support for the basement excavation. ) Access opening in this slab shall be provided for further excavation. 6. Excavate beneath the ground floor slab down to next basement floor soffit. 7. Cut the steel casing, remove the gravel and expose the steel column. 8. Cast the second basement slab. The slab is connected to the columns with shear studs and connected the diaphragm wall with dowels) 9. Repeat the process for the successive basement floors until down to the final basement slab. The top-down method provides the following main advantages:1. Superstructure can be constructed at the same time as the basement construction takes place and therefore the overall construction time is reduced. 2. Temporary and permanent works are combined and therefore there is no need for extensive steel temporary works. 3. Stiff rigid walls allow an almost watertight construction and basement construction to great depth. These stiff walls provide at the same time a limitation to ground movement. 10/11 3 – basement Steel casing infilled with granular material Steel column on top of bored pile Reference: Control of groundwater for temporary works (1986), S. H. Somerville, CIRCA Construction Technology (1987), R. Chudley, Longman Building Construction Handbook (1992), R. Chudley, Newnes Introduction to Civil Engineering Construction (1985), R. Holmes, College of Estate Management Civil Engineering Construction IV (1991), S. A. R. Jufri R. J. Wellmen, Hong Kong Polytechnic 11/11 How to cite Basement, Papers

Dublinerscounterparts Essay Research Paper DublinersCounterpartsBy James JoyceAfter free essay sample

Dubliners-counterparts Essay, Research Paper Dubliners ? Counterparts? By: James Joyce After reading several narratives from James Joyce? s Dubliners, many of the subjects are similar. There is non normally an tremendous secret plan, because all of his narratives are about working people in Dublin. Every narrative has a really of import subject that he brings out through his description of these regular people? s actions and through the scene. He does non utilize a normal narrative line, a secret plan, or a definite flood tide and declaration. In the narrative? Counterparts, ? he uses the subject of regular people? s lives, faith and alcohol addiction, all of which are repeating subjects in his other narratives. Every facet of Farrington? s life has no hope for betterment. He is scolded because he didn? t complete a contract in clip. His occupation is done half hearted, without any passion. Farrington is a clerk who copies legal paperss by manus. We will write a custom essay sample on Dublinerscounterparts Essay Research Paper DublinersCounterpartsBy James JoyceAfter or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page While being reprimanded by Mr. Alleyne, his lone replies were muttering sentences that did non stand up for himself. The manner he talks demonstrates his deficiency of exhilaration he has to populate. Farrington did non complete the contract in clip, but handed it in without the last two pages, trusting cipher would notice. When Alleyne comes down to censure him for non completing the contract, Farrington attempts to lodge up for himself. Mr. Alleyne asks the rhetorical inquiry? Do you believe me an arrant sap? ? Farrington replies rapidly with? I don? t think sir, that that? s a just inquiry to set to me. ? Mr. Alleyne is embarrassed because Miss Delacour is in the room. There were rumours that Miss Delacour was holding an matter with Mr. Alleyne. The rumours said that he was dating her because she was a affluent lady. Now if he did non apologise to Mr. Alleyne, he would be fired, but Farrington doesn? T attention. His ideas are non on his occupation, but on how he is traveling to acquire rummy. The subject of alcohol addiction shows up throughout the narrative. After Farrington? s foremost call on the carpeting by his director, he takes a interruption and mom kes a speedy halt at O? Neill? s store for a glass of port. He could non wait until after work for a drink. After go forthing the office, he tries to happen money so that he could slake his? thirst. ? Farrington knows that he can non inquire for an promotion on his payroll check, so he pawns his ticker, receives six shillings, and dives into a strident dark. Farrington is the adult male of the dark because he tells his friends O? Halloran and paddy Leonard about how he stood up to Mr. Alleyne in forepart of Miss Delacour. Just when everything was traveling right, a immature adult male named Weathers challenges him to an arm wrestling. He returns place angry and unhappy because he loses. When he gets place, Joyce shows how the effects of alcohol addiction affect non merely the alcoholic. As he makes his manner place, he thinks about his twenty-four hours with choler and vindictiveness. Talking back to his director, soaking his ticker, and passing all his money were merely some of the events that discontented Farrington. His married woman is out when he gets place, and dinner is non ready for him. This frustrates him even further, and has to take his choler out on something. Farrington? s boy is willing to do dinner for his male parent, but he merely needed to let go of his choler. He took a walking stick and crush the small male child. It is dry because while being beaten, his boy shrieks? ? I? ll say a Hail Mary for you pa, if you don? T beat me? ? This brings in his subject of faith. It plays a big portion in Dublin? s habitue, working category people. Farringon? s boy demonstrates the importance of faith because he does non contend his male parent, but merely tells him that he will pray for him. Another illustration of faith in their lives is when Farrington gets place from saloon hopping. His married woman International Relations and Security Network? T place because she is at the chapel. This shows that the people of Dublin go to the chapel and pray all the clip. The regular people put much religion in faith. Joyce did an astonishing occupation explicating the adversities of regular people? s lives. He showed the societal, economical and emotional sides of these working people? s lives.