why does the metal handle of pot get hot after some time, while a plastic  handle usually does not?
112713
Metal is an excellent conductor of heat while plastic is not.
71035
Not 100% sure. But I think its because the air inside isn't moving. The air inside is stationary, while it is continuously circulating outside, which causes changes in the temperature. IMHO
889387
I'll give this a shot!  Typically, any metal expands in size when heated.  The Safari company that builds motorhomes in Oregon used overhead heat lamps to heat up to 40 foot long aluminium panels prior to installation on the outside walls of their motorhomes.  Once heated, the panels were riveted in place on the sides of the motorhome.  Once it cooled down to ambient temperature, the panels become very taut due the contraction. It was a quite good manufacturing method they used for years.
443503
Ceramic is a poor conductor, therefore it is an insulator!  It will keep your coffee hot longer.  Tin is a good conducter, so it will let your coffee cool faster.
262813
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.
1187133
It really depends on what type of plastic it is.  Some plastics are made to be melted and reused (recyclable plastic), but other plastics are not made to be melted and reused.  These plastics would probably catch on fire before they melted.  What exactly are you trying to do?
107873
Because the magnet is just Iron, which can be heated up a LOT without disintergrating.  In fact, the pressure keeps it as a solid, which wouldn't normally happen at that temperature.
1079581
Because the earthern pot has pores in it . By which some water droplets comes out & evapourate. During evapouration some heat is absorbed from the pot .\nHence the pot cools down & the water also.
145994
The metal spoon is a good conductor of heat. It also has a handle that protrudes out, with a fair amount of surface area to radiate heat out, and the spoon will also cool by convection. This definitely will cool the coffee down faster.
30165
This really depends on what liquid versus what solid you are heating.  Some liquids are actually less heat conductive that solids.\n\nFor example,  if you have some oil and some aluminum then the aluminum is going to heat up faster than the oil would.
129560
when we heat the jar, the metal lid and the jar absorbs the heat and expand.since the expansion of the metal lid is more than the jar it easily comes off.
1024879
I have the same problem with my electric stove.  Overtime, (just like everything) they got worn out and what my neighbor did was replace the entire unit...thus giving her an excuse to remodel the ktichen.  However that is WAY too expensive...Is it that every plate does not heat up as much as it used to?  Now my family's remedy is to use the plates that we hardly used before (the ones in the back for example).  I haven't taken any courses in engineering but I would love to explain why if I had :(  I agree with the previous post, call a professional in electrical appliances.
144979
metal expands when heated...hence the lid will become wider and easier to open...
111649
I don't have an answer for you except that it has something to do with the softness of the lead, I think.  But that made me laugh, so thanks for that, and thanks for the 2  :-)
1085489
Metal objects such as the spoon & the pointed ends of the fork act to concentrate the electric field formed at the tips. This has the effect of exceeding the dielectric breakdown gradient of air, about 3 megavolts per meter (3×106V/m), causing sparks to form. This effect is somewhat analogous to the effect of St. Elmo's fire.\nMetal or conductive object placed into the microwave will act as an antenna, and its electrons will thus be thrashed back and forth through the object (a high frequency alternating current) causing some ohmic heating to occur\n\n- no damage to magnetron, but !
737517
Their behaviour when you heat them:\nThermoplastics soften, and re-set on cooling.\nThermosetting plastics don't soften at all, and merely catch fire if you overdo the heating!
330815
"Each hob contains one or more coils made of ferromagnetic material. When an alternating current is passed through these coils, a magnetic field of the same frequency is produced. If a magnetic-based pan is placed on the hob, the magnetic field induces a current in the pan. The internal resistance of the pan causes heat to be dissipated, following the Joule effect. Thus it is the pan itself, and not the cooktop, that heats up and cooks the food. Once the pan is removed from the cooktop, the energy transfer stops. The result is a flame-less method of cooking in which it is nearly impossible to start a fire by forgetting to turn off the stove. Parents won't have to worry about their child touching a hot burner because the cooktop surface remains cool. Changing cooking temperatures is achieved quickly because there is no wait for the hob to heat up, only the pan. Since there is no transfer of heat energy between the hob and the pan, less heat is lost into the air, resulting in a more efficient means of cooking, not to mention a more agreeable cooking environment."\n\n\nhope that help?  we just renovated our kitchen and have installed a Miele induction cooktop and it works wonderfully.  It provides much greater control over temperature...and I am still shocked at how quickly water comes to a boil.  Who knew a stove would be so exciting? haha.