could u tell me 3 differences between conduction , convection and radiation? please?
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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.
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Convection, driven by the release of heat from the Earth's mantle.   Like a pot of vegetable soup on the stove.   The vegetables on the surface move around.   Some are subducted and others surface.
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Heat leaves a bottle either through Convection, Radiation or Conduction.\n\nWith the vacume, you eliminate Convection and Conduction, because there is no air for the convection and the inner suface is in contact with the outer surface, and therefore no Conduction. The Silver Bottle reflects that radiation and preserves the heat even more efficiently.\n\nI hope you understood and thanks for making me revise my science class information.
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A current is simply a flow of electrons in a direction.  These electrons collide with the materials in the wire, which in turn vibrate, thus producing heat.  A curving wire re-directs the flow of the electrons, whose inertia resists the change in velocity (direction).  The material must then act upon the electrons normal to the curve, which produces stronger collisions (greater resistivity) and thus more heat.
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1. flow of electrons\n2. mechanical energy\n3. motor, lightbulb\n4. the rate of flow of electrons
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A good example of conduction is when you leave a spoon in boiling water, it gets hot. This is because the water molecules transfer or conduct heat to the spoon molecules. This is different to radiated heat, like sitting in front of a fire where the amount of heat you receive is directly proportional to the square of the distance from the heat source. Jules. Australia.
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Heat energy.\n\nThere is water (or a water mixture) cooling the core directly.  This water is radioactive.  You then have coils running in the water which have other water (protected from the radiation) coursing through them.  This water gets the heat transfered to it and turns to steam.  The steam runs turbines that turn a magnet core in the center of a copper coil that in turn produces electricity.\n\nHope this answers it for ya, feel free to email me!
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a and b.  Radiation (nuclear type) does not necessarily need matter as a medium.  Convection and Conduction however do.  Hope this helps
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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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Convection is the mode of heat transfer in fluids (liquids and gases). Convection depends on the fact that, in general, fluids expand when heated and thus undergo a decrease in density (since a given volume of the fluid contains less matter at a higher temperature than at the original, lower temperature). As a result, the warmer, less dense portion of the fluid will tend to rise through the surrounding cooler fluid, in accordance with Archimedes' principle. If heat continues to be supplied, the cooler fluid that flows in to replace the rising warmer fluid will also become heated and also rise. Thus, a current, called a convection current, becomes established in the fluid, with warmer, less dense fluid continually rising from the point of application of heat and cooler, denser portions of the fluid flowing outward and downward to replace the warmer fluid. In this manner, heat eventually may be transferred to the entire fluid. Convection currents are widely observed in both liquids and gases. Many aspects of weather are connected with convection currents. For example, when a portion of the atmosphere becomes heated by contact with a warm area of land, it rises into the cooler, higher altitudes, with the result that some of the moisture carried with it may be condensed to form clouds and precipitation. Convection currents have been used for heating and ventilation since ancient times. Both hot-air and hot-water heating systems use convection to transfer heat through the entire structure being heated. Convection currents also assist in the ventilation of mines.
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Hola Umar! Im just as confused as you are!\n\nNot Anymore, I got it! It is the Convection Zone!!!!!\n\nAbraham asked this question, I found it and did a double check and it is right!
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The amount of heat transfered is\n\n1) directlly proportional to the area of the sheet of given material. (A)\n\n2)directly proportional to the temperature difference on both sides of the sheet. (T2-T1)\n\n3)dirctly proportional to the time.(t)\n\n4)inversely proportional to the thickness of the sheet. (d)\n               \n---------------Q= A * (T2-T1) * t  /  d------------------------
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Well, get out your heat transfer text book and start calculating. You should have all the info you should need.
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Given a fixed power of heat input water would take longer due to its specific heat capacity being large.  4180Joules/kg/degree, compared with 450 for iron & 880 for Aluminium (figures STRICTLY only from memory and not to be relied on)\nOther than that are consideration of good conduction of heat in metals versus convection transporting the heat quickly within the water.\nAlso practically speaking, you might need to allow for evaporative heat loss from the water surface.
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Go to go ogle web site and type Heat Transfer u will get abundant information about the process OK babe bye.
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Foam cups contain air pockets, and this makes them better insulators. Heat travels by conduction, convection or radiation. \n\n1. Conduction\n\nThe air pockets drastically reduce the heat transmission by conduction. Heat travels more easily through the ceramic by conduction than it does through the foam with the air pockets. \n\n2. Convection\n\nSince ceramic contains few if any interstices; so there is definitely less air in ceramic than there is in the foam. However, in both cases, the air pockets are very small, limiting the amount of heat that can be transmitting by conduction. \n\n3. Radiation\n\nInfrared radiation is probably passed more easily through ceramic than foam, especially given the color of most foam, which tends to make it quite reflective. \n\nA quick way to tell how insulating they are is to feel the foam and the ceramic with your hand, to determine which feels cool to the touch and which feels warm. The foam definitely feels warmer, since it reflects the heat back from your hand. The ceramic will likely feel cooler to the touch, and therefore it is not as good at insulating.
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To keep it simple, temperature doesn't travel only heat travels. It does so by conduction, convection or radiation.