The Factors Influencing The Mpemba Effect Essays

The Factors Influencing The Mpemba Effect Essays The Factors Influencing The Mpemba Effect Paper The Factors Influencing The Mpemba Effect Paper The Mpemba Effect is a phenomenon in which hot H2O freezes faster than cold H2O. This phenomenon was discovered in Tanzania, Africa, by a high school pupil named Mpemba. ( Kurtus ) Conduction, convection, radiation, and vaporization are methods through which heat can be transferred from one substance to another and are necessary in understanding the Mpemba Effect. When an object or liquid is at a different temperature than its milieus, heat transportation occurs so that all the organic structure and its milieus become in a province of thermic equilibrium. This means that they are all at the same temperature. ( Heat transportation: Wikipedia ) Heat is continuously being transferred throughout our environment all the clip. Heat is normally transferred from high temperature objects to take down temperature objects. An illustration of this is when stepping on hot sand. The heat transportations from the hot sand to the ice chest object which is the pess. Heat transportations from certain stuffs better than others, for illustration, glass or plastics. If several objects that do non hold the same temperatures come in contact with each other, the heater objects turn ice chest and ice chest objects turn heater. ( Hewitt 270 ) When the transportation of heat occurs through direct contact it is called conductivity. When heat is being transferred by conductivity, atoms vibrate against each other. For illustration, when an eating utensil such as a spoon is placed in hot soup the utensil gets warmer because the heat from the soup is being transferred onto the spoon. Conduction is much better in solids because atoms in a solid are in changeless contact, whereas in liquids and gases the molecules are normally non as near, cut downing the possibility of the molecules to clash and go through thermic energy. Metallic elements are most of the clip the best music directors of thermic energy due to the manner metals are bonded. They contain more free moving negatrons and are hence able to reassign energy rapidly through the metal. ( Heat transportation: Wikipedia ) For illustration, when one terminal of an Fe nail is placed over a fire, it will rapidly go excessively hot to keep due to the many free traveling negatron s carry oning heat. As the denseness of the object decreases, so does its conduction, hence fluids and gases are less conductive than metals. ( Hewitt 271 ) When heat is transferred by motion of warmed affair it is called convection. It is the transportation of thermic energy in a gas or liquid by motion of currents. For illustration, when heating H2O in a pan, the molecules at the underside of the pan becomes less heavy and are pushed up by denser ice chest fluids that take up its topographic point at the underside of the pan. ( Kurtus 2002 ) Convection can do circulation in a liquid, as in the warming pot of H2O over a fire. As the het H2O expands and becomes less heavy it rises. The ice chest more heavy H2O near the surface so drops and forms of circulation can organize. The possibility of convection occurs in all fluids, whether they are liquids or gases. Convection besides occurs in a gas. Warm air rises because it is less heavy than the ice chest air, hence drifting upward. ( Heat transportation: Wikipedia ) Radiation is electromagnetic moving ridges that transport energy straight, through infinite. Sunlight is a signifier of radiation that is radiated through infinite to Earth. This heat is non transferred through conductivity because nil is touching the Sun to our planet for conductivity to be possible. Convection is non possible for conveying heat to the Earth since there are no fluids in infinite. The Sun transportations heat through 90 three stat mis of infinite! It is all radiation that brings heat to our planet. ( Mansfield ) This energy is called beaming energy. Radiant energy comes in the signifier of electromagnetic moving ridges. Electromagnetic moving ridges include: microwaves, wireless moving ridges, infrared radiation, ultraviolet radiation, X rays, seeable visible radiation, and gamma beams. ( Hewitt 275 ) The Earth freshnesss and emits radiant energy. This freshness is nons of radiant heat are the firing coals in a hearth, a lamp fibril, and the Sun. They all emit infrar ed radiation and seeable visible radiation. When some of this energy falls on other objects, some of the energy is reflected and some absorbed. The captive energy increases the internal energy of the objects. ( Hewitt 276 ) A alteration from a liquid to gas that takes topographic point on the surface of a liquid is called vaporization. When the temperature of a liquid increases, its molecules move all about and run into each other and travel at different velocities. Molecules at the surface of the liquid addition in kinetic energy by being hit by molecules from below and may acquire adequate energy to interrupt away from the liquid, and wing off, turning into vapour, this is vaporization. ( Hewitt 288 ) An illustration of vaporization is a puddle of H2O on a pavement and one time the H2O is warmed by the Sun, the H2O molecules at the surface of the H2O flight and turn into a gas. Vaporization trades with the energy of single molecules and non about the mean energy of a system. Not all molecules in a liquid have the same energy. Not all molecules have the same sum of energy. In order for a molecule to vaporize and go forth the liquid to turn into a gas it must foremost derive adequate energy. The rate of vaporization can besides go faster with a lessening in gas force per unit area around the liquid. ( Chem4kids.com ) The Mpemba Effect was discovered by a high school pupil named Erasto Mpemba from Tanzania, Africa in 1963. While in the procedure of doing ice pick, Mpemba noticed this phenomenon. He and his co-workers were utilizing a mixture which included boiling milk. They were supposed to wait until their mixture cooled because they were told that hot objects could damage the icebox. However, Mpemba recognizing that infinite was scarce in the icebox put his hot mixture in without leting it to chill. A small subsequently he realized that his hot mixture froze foremost. He told his instructor of his findings, of which his instructor told him that he must be confused. It took several old ages before university professors accepted his find. It is under certain conditions affecting methods of how heat is transferred that the consequence could take topographic point. ( Science Buddies ) The phenomenon, while simple to depict, is deceivingly complex, and illustrates legion of import issues about the scientific method: the function of incredulity in scientific enquiry, the influence of theory on experiment and observation, the demand for preciseness in the statement of a scientific hypothesis, and the nature of falsifiability. ( Jeng 1 ) When Mpemba was doing ice pick and made his find he was nt utilizing a timer, but he was smart plenty to detect the difference in stop deading times. ( School for Champions ) At first the Mpemba Effect seems impossible, how does H2O that s warmer freezing faster than H2O that s colder? However there are many different factors that determine whether or non the Mpemba Effect will be successful. There exists a set of initial parametric quantities ( H2O mass, gas content of H2O, container form and type, and infrigidation method ) , and a brace of temperatures, such that given two organic structures of H2O indistinguishable in these parametric quantities, and differing merely in their temperatures, the hot one will stop dead Oklahoman. ( Jeng 6 ) Since there are so many factors that can be varied, experiments to turn out the Mpemba Effect frequently lack in consistent consequences. Plants Cited Paul G. Hewitt. Conceptual Physics. San Francisco: Addison-Wesley, 1998. School for Champions. Ron Kurtus. October 2002. hypertext transfer protocol: //www.school-for- champions.com/SCIENCE/Mpemba.htm. Hot Water can stop dead faster than cold? ! ? Monwhea Jeng. 2005. Science Buddies. Andrew Olson, Ph.D. 2007 hypertext transfer protocol: //www.sciencebuddies.org/science-fair-projects/project_ideas/Phys_p032.shtml. ? fave=no . Heat Transfer- Wikipedia, the free encyclopaedia. 2010 hypertext transfer protocol: //en.wikipedia.org/wiki/Heat_transfer. Heat Transfer. Laurie Jarvis, Deb Simonson. hypertext transfer protocol: //hyperphysics.phy-astr.gsu.edu/HBASE/thermo/heatra.html. Chem4kids.com. Matter: Vaporization. Andrew Rader Studios. 2009 hypertext transfer protocol: //www.chem4kids.com/files/matter_evap.html Convection, Conduction and Radiation. hypertext transfer protocol: //www.mansfieldct.org/schhols/MMS/staff/hand/convcondrad.htm

How Laszlo Biro Changed the History of Ballpoint Pens

How Laszlo Biro Changed the History of Ballpoint Pens No man was more foolish when he had not a pen in his hand, or more wise when he had. Samuel Johnson. A Hungarian journalist named Laszlo Biro invented the first ballpoint pen in 1938. Biro had noticed that the ink used in newspaper printing dried quickly, leaving the paper smudge-free, so he decided to create a pen using the same type of ink. But the thicker ink wouldnt flow from a regular pen nib. Biro had to devise a new type of point. He did so by fitting his pen with a tiny ball bearing in its tip. As the pen moved along the paper, the ball rotated, picking up ink from the ink cartridge and leaving it on the paper.   Biros Patents This principle of the ballpoint pen actually dates back to an 1888 patent owned by John Loud for a product designed to mark leather, but this patent was commercially unexploited. Biro first patented his pen in 1938 and he applied for another  patent in June 1943 in Argentina after he and his brother emigrated there in 1940.   The British government bought the licensing rights to Biro’s patent during World War II. The British Royal Air Force needed a new pen that would not leak at higher altitudes in fighter planes the way fountain pens did. The ballpoint’s successful performance for the Air Force brought Biro’s pens into the limelight. Unfortunately, Biro had never gotten a U.S. patent for his pen, so another battle was just beginning even as World War II ended.   The Battle of the Ballpoint Pens   A lot of improvements were made to pens in general over the years, leading to a battle over the rights to Biros invention.  The newly-formed Eterpen Company in Argentina commercialized the Biro pen after the Biro brothers received their patents there. The press hailed the success of  their writing tool because it could write for a year without refilling. Then, in May 1945,  Eversharp Company teamed up with Eberhard-Faber to acquire exclusive rights to Biro Pens of Argentina. The pen was rebranded as the â€Å"Eversharp CA,† which stood for â€Å"capillary action.† It was released to the press months in advance of public sales. Less than a month after Eversharp/Eberhard closed the deal with Eterpen, a Chicago businessman, Milton Reynolds, visited Buenos Aires in June 1945.  He noticed the Biro pen while he was in a store and recognized the pen’s sales potential. He bought a few as samples and returned to America to launch the Reynolds International Pen Company, ignoring Eversharp’s patent rights. Reynolds copied the Biro pen within four months and began to sell his product by the end of October 1945. He called it Reynolds Rocket and made it available at Gimbel’s department store in New York City. Reynolds’ imitation beat Eversharp to market and it was immediately successful. Priced at $12.50 each, $100,000 worth of pens sold their first day on the market. Britain was not far behind. The Miles-Martin Pen Company sold the first ballpoint pens to the public there at Christmas 1945.   The Ballpoint Pen Becomes a Fad Ballpoint pens were guaranteed to write for two years without refilling and sellers claimed they were smear-proof. Reynolds advertised his pen as one that could write under water. Then Eversharp sued Reynolds for copying the design that Eversharp had acquired legally. The 1888 patent by John Loud would have invalidated everyones claims, but no one knew that at the time. Sales skyrocketed for both competitors, but Reynolds’ pen tended to leak and skip. It  often failed to write. Eversharp’s pen did not live up to its own advertisements either. A very high volume of pen returns occurred for both Eversharp and Reynolds. The ballpoint pen fad ended due to consumer unhappiness.  Frequent price wars, poor quality products, and heavy advertising costs hurt both companies by 1948. Sales nosedived.  The original $12.50 asking price dropped to less than 50 cents per pen. The Jotter   Meanwhile, fountain pens experienced a resurgence of their old popularity as Reynolds’ company folded. Then  Parker Pens introduced its first ballpoint pen, the Jotter, in January 1954. The Jotter wrote five times longer than the Eversharp or Reynolds pens. It had a variety of point sizes, a rotating cartridge, and large-capacity ink refills. Best of all, it worked. Parker sold 3.5 million Jotters at prices from $2.95 to $8.75 in less than a year. The Ballpoint Pen Battle Is Won   By 1957,  Parker had  introduced the tungsten carbide  textured ball bearing in their ballpoint pens. Eversharp was in deep financial trouble and tried to switch back to selling fountain pens. The company sold its pen division to Parker Pens and Eversharp finally liquidated its assets in the 1960s. Then Came Bic   The French Baron Bich dropped the ‘H’ from his name and began selling pens called BICs in 1950. By the late fifties,  BIC  held 70 percent of the European market.   BIC bought 60 percent of the New York-based Waterman Pens in 1958, and it owned  100 percent of Waterman Pens by 1960. The company sold ballpoint pens in the U.S. for 29 cents up to 69 cents. Ballpoint Pens Today   BIC  dominates the market in the 21st century. Parker, Sheaffer, and Waterman capture smaller upscale markets of fountain pens and expensive ballpoints.  The highly popular modern version of Laszlo Biros pen, the BIC Crystal, has a daily worldwide sales figure of 14 million pieces. Biro is still the generic name used for the ballpoint pen used  in most of the world.