i am doing an experiment to try and see which material keeps a hot coffee warm.?
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The heat energy is transfered away from the hot coffee to the cooler surrounding by all three methods, \nconduction, convection, and radiation.\n\nHeat [energy] is conducted from the hot coffee to the surroundings (air, container, ...), in addition, small convection currents develop to help the conduction process take place.  In addition, energy is also lost through radiation.  The hot coffee also emits a small amount of  infra red radiation which is invisible to the naked eye, this radiation carries energy away from the coffee, gradually cooling it.
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Piece of cake. \nUse coffee - the old favoutite.\nJust spray some coffee over your paper/page (AFTER you've completed your work). \nIt will look a cool brown - authentic, and ancient.\nTo supplement this you may use an iron (burn the edges)\nHave fun and take care!
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What will work for you depends a lot on what the material to be coated is, on the application, time spent at temperature, heat cycling, peak temperatures, etc.\n\nHere's a non-ablative coating for metals that can withstand sustained temperatures of 850ºC (1560ºF) and thermal shocks from 1030ºC (1885ºF) immediately to a cold water bath:\n\nhttp://www.indestructible.co.uk/cat2/PL134-R1.html
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Heavy Metal! Just joking. http://www.scienceproject.com/projects/intro/elementary/EX057.asp Go here, they have a lot of information.\n\nhttp://www.science.ca/askascientist/viewquestion.php?qID=1216 And this one. It is clear that aluminum conducts the best heat.
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electromagnetic or magnetic fields. It is easiest to research and to do the practical of. Just place the magnets and use iron filings to measure it
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Here are some experiments that I found:
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buy tea bags.\n\nBoil the water.\n\nPut your tea bag into a coffee mug\n\nPoor the boiling hot water on top\n\nLeave in and stir for a minute.  \n\nTake out at desired color. \n\nDrink.  Enjoy.
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Scientists at the Massachusetts Institute of Technology (MIT) did a scientific study on this years ago.\n\nThe rate of loss of heat from a liquid is a function of the starting temperature to the 4th power (T^4).  So, if you want your coffee to stay warmer longer, add the milk immediately.  It immediately reduces the initial temperature.
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What a good question!  I think it's due to our expectations.  Next time you drink your cold coffee, make yourself believe it was an iced coffee and see what your reaction is.
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about heating maching bring a thick wire and wrap it around a spoon then the tips connect them into electric source (big one) dont do it alone it gets really hot ...ok\nabout the cooling machine i dont know
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One could argue plastic wrap since the Aluminum foil would allow for greater heat conduction into the orange from the air.\n\nAluminum, being a metal, is a good conductor of heat.  The metal foil will allow for heat from the "hot" air to be conducted into the "cold" orange much quicker than the plastic wrap would.\nI dont think the light enegry being absorbed or reflected is that significant.\n\nTake the opposite case as an example, say you had a hot metal pot of water an you wanted to set it on some surface so that it stays hot the longest.  If you set the pot on a metal cooking sheet, the heat will be conducted away from the pot and into the air much quicker than if you were to set it on a peice of wood for example.
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There are lots.  A great example are hand-warmers people use while skiing.  The packets contain fine iron powder that reacts exothermically with oxygen creating a steady stream of heat.  \nWhite phosphorus will spontaneously ignite in air and can be used as an source of fire for napalm and the like.\nThere is currently a company that sells a portable coffee experience where hydrochloric acid and sodium hydroxide neutralize in a jacket surrounding water, causing it to percolate through ground coffee, be filtered etc.  Instant hot coffee on demand!
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Cool.\n\nUse the FOIL method. First, outside, inside, and last.
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Go with a line graph, that way you can also find out (or estimate) temperatures at times when you didnt measure it.
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I would use a length of nichrome wire (see links below) stretched between a couple copper blocks. You could make some sort of pinch block out of the copper and connect a power supply to the copper. (or drill a hole through it with a set screw, tap a hole and us a pan head screw)  You will have to insulate the copper from the rest of the world so you don't short something out.  G-10 (a glass/epoxy resin) makes a good moderately high temperature insulator.  One of the contacts should be fixed and the other allowed to "float" and allow for changes in the length of the wire due to heating.  A spring could be used to provide tension or an air cylinder.  The power supply will depend on the length and diameter wire you choose.  If there is a problem with the electrical contacts heating up, you could run some cooling water through them.  Just drill a hole through it and 1/8 NPT pipe tape both ends.  You can plumb some water to it and it will keep the copper chilled.
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Solid\nCopper melts at 1083ºC
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Take timer and thermometer.\n\nHeat the first metal, and check temperature every 5 seconds or so and write the temperature in a table.\n\nDo it with all the metals you want to check and compare the results.\n\nit should take about an hour depending on how many differnt metals you want to check, and it dont cost much.