What does duck tape prevent from heat transfer? (Conduction, convection, radiation)?
471285
convection is the transfer of heat by the flow of air. Duct tape prevents air from flowing outside of the ducks.
39553
I don't know the specific name for it, but, in telecommunications, there is a certain type of plastic used for insulating wires.  This insulation is known as self extinguishing, in that, as heat is applied to it and it gets to the point where it starts to try to burn, it releases some kind of gas that extinguishes the combustion that is beginning to take place.
84110
whoissarthak's idea works, but that isn't a wet suit; that's a dry suit.  A wet suit works differently.  The idea is that there are basically three ways to move heat: conduction, radiation, and convection.  Conduction is when two things are in direct contact, like touching a hot stove or a cold flagpole.  Radiation has to do with the infrared light emited by warm bodies, and has nothing much to do with your project.  Convection is the real concern--it is the transfer of heat by means of a fluid intermediate, and it is the fast form of heat loss.\n\nYou're body sheds heat by means of perspiration, where sweat evaporates and takes heat away with it--that's convection.  When you fell colder in a strong breexe, that's convection taking heat away quicker.  When you blow on a spoon of hot soup to cool it, that's convection.\n\nThe way a wetsuit works is by not allowing the water in contact with the skin to be carried away.  It inhibits the movement of water through it.  Enough gets in to contact the skin and make your skin wet, which is why they call it a wetsuit, but that water doesn't leave easily.  It stays put and your body heats up the water.  Hence, the water in your wetsuit is much warmer than the water in the surrounding ocean, so the water taking heat from your skin is not quickly carried away and replaced by more cold water.\n\nIf you want to make a wetsuit, you want something htat will make it difficult (but not impossible) for water to come and go.
620837
Thermal insulation blocks the movement of heat.\n\nTypical thermal insulations are spun glass or fiber glass that traps air.  Trapped dead air is a very good insulator because it prevents convection transfer of heat.\n\nA vacuum is also a good insulator and that is how a thermos bottle works.\n\nStyrafoam is another excellent insulator.\n\nThe higher the R value on an insulating product, the more heat that it will block.\n\nConsider this temperature gradient and heat flow:\n\nOutside it is 5ºF.  Inside it is 70ºF.  Over the span of 4 to 6" in a normal wall, the temp gradient is 65 degrees!  What prevents all that heat from rushing outside?  Good insulation of R13-R19 in the wall.
674634
Heat is transferred by conduction, convection and radiation. In medium-temperature applications radiation would only be a small part of the total, and an opaque material will prevent radiative escape of heat in any case. Conduction and convection are minimized by the structure of a typical insulator in addition to the material properties mentioned in the first answer. Styrofoam, for instance, consists of very thin partitions of styrene plastic which enclose gas-filled bubbles. This means each convection cell or mixing space is small and essentially a small proportion of the total insulation thickness, so you don't have the coldest internal gas mixing with the hottest gas. Conduction is low because gas conducts heat more slowly than a solid. The conduction path through the solid styrene is convoluted and of small thickness, both of which minimize conduction. In houses, fiberglass insulation uses similar principles except that the air spaces are connected. This means a larger convection cell potentially exists, but it is baffled by all the glass strands, so circulation and mixing are much slower and smaller-scale.
704288
Depends on the liquid, generally it is transfered from the bottom of the glass into the bottom of the liquid, but some of the heat will transfer up the tube as well.  Best bet any witch way is to angle it a little, and keep it pointed away from you and anyone else, agitate the liquid to help keep the heating even either by rocking it by hand or through the use of a spin vane.
545704
Well, get out your heat transfer text book and start calculating. You should have all the info you should need.
203243
Any magnetic field motion against any resistance will generate heat- It is a linear relationship, so the faster it moves, the greater heat generated.  There is no minimum speed below which NO heat is generated.
762680
its heat; radiators give off heat and so does the friction caused by moving atoms
472455
Heat transfer can occur through convection (ex: In the winter, the wind makes you colder), conduction (ex: heating a pot of water on an electric stove), and radiation (ex: sunlight warming the earth).
1183093
sun bathing is radiation. sun radiation travel through space(no air in space so it is pure radiation energy transfer), travel through air (in there also radiation is dominant ) then get in to your skin\n\nstroform is a good insulater. it has hollo set of chambers. in chambers covection can be done but cells prevent transfer of air further and convection is stoped. in the other hand conduction is prevented due to poor conductivity of material. radiation is not a problem when heat difference is not too much high and because radiation generated from a object is is propotional to absolute heat  of the object. in case of very high temperature allumenium foil is used to limit radiation.
971459
All 3 are different modes of transferring heat\n\nConduction: This is generally seen in metals, because they have free ions. When a metal is heated, the free ions which are in the lower orbit get excited. These ions move to the higher orbit and in turn excite the ions in the adjoining molecule. In this way heat is transferred. This is not seen in non-metals because they don't have free ions.\n\nConvection: Seen in water, air and other liquids and gases. Convection takes place due to imbalance in temperature in different parts of the liquid (or gases). Due to heat being applied, the hot liquid (or air) goes upwards and the cooler liquid (or air) goes downwards, thus creating a cyclic current. As this liquid gets heated further, it moves upwards again and the now cooler liquid goes downwards.\n\nRadiation: It is the only form of transfer of heat that DOES NOT necessarily require a medium to transfer heat. Radiation takes place in the form of electromagnetic waves. Radiation can even transmit through vacuum, unlike Conduction and Convection which require a material medium. Eg. Radiation of heat by the Sun to Earth.
161347
a and b.  Radiation (nuclear type) does not necessarily need matter as a medium.  Convection and Conduction however do.  Hope this helps
89089
Besides the typical methods such as refrigeration which uses expanding freon or amonia gas to transfer heat or standard evaporation, two other electro-mechanical methods come to mind.\n\nOne method is a thermoelectric cooler which can heat or cool based on the direction of DC electric current flow. It is built from a junction of two metals which are different and when DC current passes through the junction, heating or cooling can occur depending on the direction of the flow of the DC current. This is known as the Peltier effect.\n\nThe second totally mechanical method is known as a Vortex seperator. Air is introduced at high speed into a tube with a curving vane inside. As the air spins up through the tube, the colder air, which is heavier is forced outside due to centrifical force while the air moving up the center is warmer and lighter than the cold air. The difference in the weights of the cold and warm air cause them to seperate from each other with the cold air unable to make the tight turns and is forced to the outside of the tube as it spins to the top. These units typically have a cold air output connection on the outside of the tube at the end and a warm air connection in the center of the tube at the end.
747619
Does it have to be a material? the best solution for this would be to have 2 cans one just inside the other with a compleat vacume between them, as there is no air to transmit the heat between them the liquid inside wont change tempreture.\n\nthis is the principle of a thermos flask,\n\nif you need an actual material, somthing that would trap air to stop it from moving and spreading the heat such as glass fiber like you might have in your loft\n\nhope this helps
812553
ok my way is an extreme but i suggest encase it in silicone let it dry then its water proof i saw a pic of a cooling system for a mother board it was encased in silicone and put in a fish tank \n\nBUT BE WARNED ENCASING IT IN SILICONE WILL ADD TO THE HEAT PROBLEM ON SOME BOARDS
1101939
A thermocuple might be the one you seek. \n\nThe seebeck effect on thermocouple uses this theory, as there are two different material soldered together to make a single V or U shaped bar, there is a point where those two metals met. When we heat that point, the heat will move the electron, and since one metal has different coefficient than the other, so the electron will move from one metal to the other, thus an electric current will be created.\n\nPeltier effect, uses the vice versa theory, thus if we put electrical current through that thermocouple, then the thermocouple will need to absorb heat from it surroundings, thus, it will lower the ambient temperature.\n\nI haven't got any clue on how effective does this "refrigerant" work, but I think It might, might, might, work..