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Reader questions and feedback on physical science. Also refer to physics, chemistry, astronomy, electricity, magnetism, electromagnet, light, sound, waves, forces, work, energy, friction, heat, thermodynamics, Ron Kurtus, School for Champions. Copyright © Restrictions Answers to Readers' Questions on Physical Science:Mpemba EffectThe following 38 comments and questions have been sent in. They are listed according to date. List of first 10 items
Expansion of hot water and iceQuestionJuly 6, 2010 I am not a physicist Jacob - Ireland 20019 AnswerAs water cools toward freezing, it contracts. However, as it solidifies, it forms a crystalline structure that expands. Once all the ice crystals are in order, the ice will then contract with colder temperatures. What type of thermometer should be used?QuestionApril 15, 2010 What type of thermometer should my daughter used for this experiment? - USA 19550 AnswerMost inexpensive thermometers that show the freezing point will work. But note that it must be put in water. Water not smart enough for experiment to workQuestionMarch 23, 2010 From where do you purchase the intellegent water necessary for this experiment to work? If you start with two continers of equal masses of water; the first at 25C, the second at 50C - how do you get the second container to 'speed up' when it reaches 25C so that it freezes faster than the first? Start with 25C and 25.00000001C & you have st same problem. My local water is not smart enough to know it started warmer. Mike - USA 19421 AnswerIf you would check the Resources on the page about the Mpemba Effect, you will see details and proofs of the experiment from the University of California Dept of Physics, London (UK) South Bank University Applied Science Department and Binghamptom University (SUNY) Department of Physics. Want to do Mpemba EffectQuestionSeptember 30, 2009 mine and jakies science fair project reyna - USA 18412 AnswerThis is a difficult experiment. You had better try it out to see if you can make it work. Want to de Mpemba experimentQuestionMarch 10, 2009 what materials do you need? long - USA 17427 AnswerSee: http://www.school-for-champions.com/science/experiments/expmatterstates2.htm I tried the mpemba effect and need helpQuestionDecember 1, 2008 I tried the mpemba effect and I need help Nicholas - USA 16872 AnswerIt is not easy experiment to do. Using ice cube trays with hot and cold waterQuestionAugust 22, 2008 A practical application for me would to use the common plastic ice cube trays with cold and hot tap water. Controlling other factors, from which would I get ice cubes first? And approximately how much sooner? Ted - USA 16388 AnswerIt is impossible to estimate time unless all the conditions were known. Effect works with Zamboni ice resurfacerQuestionFebruary 18, 2008 My comment about the more rapid freezing of the HOT vs. COLD water dispensed by the Zamboni ice resurfacer at a pro hockey game led to my daughter's info search about this phenomenom which I had recalled from my early 70's high school physics class. Although the explanation given at that time was much more simplistic, we all became believers after a few good lab tests. Jim - USA 15391 AnswerI'm glad the material was useful to you and your daughter. Thinks Mpemba effect is obviousQuestionDecember 5, 2007 Hot water doesn't freeze at all. Only cold water freezes. During the process of cooling the hot water will become the temperature of the colder water and the process would become equal for both of them. A truer statement would be" previously heated water will freeze faster because it doesen't contain as many dissolved gases" The waters are not identical anymore than if one sample was salt water.If you heated two volumns of water and put them in full, sealed containers, kept one heated, then put them in the freezer,they would both contain the same amount of dissolved gasses and the colder sample would freeze first. J - USA 14909 AnswerObviously, hot water does not freeze. It must first get cold enough to freeze. But water starting hot freezes faster than water that starts off cold in some situations. What happened to Mpemba afterwards?QuestionJune 17, 2007 My question is to do with Mpemba himself rather than the Mpemba effect. This happened almost forty years ago in Tanzania. Where was it in Tanzania? and what became of the high school student Mpemba? Eric - Tanzania 13942 AnswerThe student's name was Erasto B. Mpemba and he went to Mkwawa Secondary School in Iringa, Tanzania. Unfortunately, we can't find any information about what happened to him afterwards. SummaryHopefully, this reader feedback has helped provide information about Science issues. ResourcesThe following are some resources on this topic. WebsitesBooks
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