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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:Thermal InsulationThe following 128 comments and questions have been sent in. They are listed according to date. List of first 10 items
Confused about thernal radiationQuestionSeptember 25, 2009 Hi, Anna - UK 18382 AnswerThe paragraph where I mention that heat cannot pass through a vacuum was on thermal conduction, which requires matter. This form of heat comes from moving molecules. I don't understand insulationQuestionMay 20, 2009 i don't anderstand the ideas about insulation system hamza - Ethiopia 17778 AnswerThermal insulation is preventing the flow of heat through a material. Metal conducts heat from one end to another quickly. But good insulators don't/ What would insulate a 12 oz aluminum can?QuestionMarch 13, 2009 okay so i have a project coming up and i was wondering what would insulate a 12 oz aluminum can? would duck type wrapped in pencils work or paper or foil?? courtney - USA 17439 AnswerYou could wrap the can with something that does not conduct heat very well. There are Styrofoam cup holders that are very good. You could wrap it in layers of newspaper, as long as the layers are thick enough. Even wrapping a wool scarf around the can could be good to insulate it. How can a stainless steel coffee mug hold heat?QuestionFebruary 25, 2009 Hi I was wondering, since metals that conduct electricity have poor insulation why do they use stainless steel in thermos coffee mugs? Doesn't stainless steel conduct electricity? - USA 17333 AnswerStainless steel is a strange metal. Although it is an alloy of steel and nickel, it is not usually magnetic. It does conduct electricity, but also, the rate that it conducts heat is only 20% of that of steel. To add to its ability to hold heat, a stainless steel coffee mug has a shiny surface which does not radiate away heat as would a dark dull surface. Testing for best insulatorQuestionOctober 30, 2008 Thank you very much, information was extremely helpful and I am very appreciative. By the way, i'm doing a sci. fair project, and I'm testing what insulator would be the best insulation to put in buildings? Cellulose, Fiberglass, or rockwool? - USA 16712 AnswerThe effectiveness of insulation is determined by its R-value, which is related to the type of material and its thickness. Temperature homework problemQuestionFebruary 20, 2008 If a space is at a temperature of 55 deg F with Humidity of 90%, the adjacent space separated by R-5 wall of 2" thick is 35 deg F with a humidity of 75%, there is no air movement, what would the temperature be at 12" from the wall on the 55 deg side? Sam - USA 15405 AnswerThat sounds like a good problem. Unfortunately, we do not solve problems. Needs to keep ice cube from meltingQuestionFebruary 6, 2008 Hey, Bob - Canada 15291 AnswerTake a look at the Reader Feedback in both Thermal Insulation and Thermos Container lessons to see what other students have done. There are plenty of examples. I think they will answer your questions. Trying to keep an ice cube from meltingQuestionFebruary 5, 2008 I have a project that I have to do, it involves keeping an ice cube from melting for several hours (6 hours to be exact). I just want to know what materials I should use? What materials are good insulators? What container should I use ( popcan, glass bottle, ect.) Also this project has to be home made. How would I place the materials to keep the ice cube from melting? Please answer as soon as possible. Thanks =P - Canada 15283 AnswerSee the lesson on Thermos Container at: http://www.school-for-champions.com/science/thermos.htm to see pictures and information. Then check the Reader Feedback to see what others students have done and to answer your questions. Is Aluminum a good insulator?QuestionFebruary 1, 2008 hi! i have to do a project on insulating a can, and keeping the water in the can as warm as possible. Is aluminum foil a good insualtor? Am I suppose to have some kind of conduction, radiation, and convection types of materials to keep the can warm? divya - Canada 15260 AnswerAluminum foil is only good to prevent radiation transfer of heat. It is not a good insulator for conduction or convection. Look at the Reader Feedback for both Thermal Insulation and Thermos Container lessons to see what other students have been doing. Must keep an ice cube coldQuestionFebruary 1, 2008 I'm doing a project that involves keeping an ice cube for several hours without melting (6 hours to be exact). I want to know how you could make it last that long. What materials should I use/what would be the best materials to use? It has to be home made. How can I prevent conduction, convection, and radiation from melting the ice cube? Please answer ASAP Thank you. - Canada 15259 AnswerStyrofoam, bubble wrap and even newspaper can insulate your container. SummaryHopefully, this reader feedback has helped provide information about Science issues. ResourcesThe following are some resources on this topic. WebsitesBooks
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