what makes iron not to lose its magetism when heated?
347526
look  for what is a magnetyou will find out a lot of stuff
797459
mixture of iron and carbon produces steel but there may be some chromium in it.
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.
271646
Silicon is essential to making of grey cast iron as opposed to white cast iron. Silicon causes the carbon to rapidly come out of solution as graphite, leaving a matrix of relatively pure, soft iron. Weak bonding between planes of graphite lead to a high activation energy for growth in that direction, resulting in thin, round flakes. This structure has several useful properties.\n\nThe metal expands slightly on solidifying as the graphite precipitates, resulting in sharp castings. The graphite content also offers good corrosion resistance.\n\nAlso A famous (and very large) example is the Iron Pillar of Delhi, erected by order of Kumara Gupta I around the year AD 400. However, unlike stainless steel, these artifacts owe their durability not to chromium, but to their high phosphorus content, which together with favorable local weather conditions promotes the formation of a solid protective passivation layer of iron oxides and phosphates, rather than the non-protective, cracked rust layer that develops on most ironwork.
87083
It stays (if it is able to!) in its atomic form. In fact it is highly reactive and therefore it is never found as a free element in the nature. It is normally kept under water at all times as it presents a significant fire hazard due to its extreme reactivity to atmospheric oxygen.
223614
copper and aluminum are best electricity conductors. I would say lead, since it's one of the densiest material out there. Heat is caused by vibrating atoms, denser material means the atoms are closer, and it's melting point is low too. As soon as you touch it with a hot soldering iron, the heat transfers right away and melts it.
227545
The soldering iron must have an insulated handle so that you can manipulate it without getting burned.  It also has a hot tip to heat the surfaces to be soldered so that the solder will melt and flow where it is needed.  Usually flux is applied to the surfaces to help the solder "wet" the surfaces rather than bead up and fall off.  Early soldering iron tips were heated in a flame and were relatively massive to hold more heat.  Now, electric soldering irons are used and can be much lighter because they have a constant supply of heat from an electric heating element.  The copper tips may also have two electrical connectors that allow electric current to pass through the tip and heat it due to resistance.  The tips are often made of copper (not iron) because it is a very good heat conductor allowing it to heat quickly and readily transfer heat to the work.  It is often necessary to sandpaper the tip to expose fresh copper and obtain the best heat transfer possible.
895890
Cast iron is not elastic, Increase the carbon content and it becomes brittle. No elasticity.
512643
ferromagnet materials will lose their magnetism if heated above a point known as the Curie temperature. \nExposure to an opposing magnetic field will "knock it down", but not demagnetize it completely.
111874
Once something has already burned, it will not burn again. Water is the result of hydrogen burning.
860483
Yes.  You can use electricity to provide an orienting magentic field while you heat the metal then quickly cool it.  How permanently depends upon a few factors including the makeup of the steel.
1161988
No.\n\nBut it can when it is heated.\n\nIf you heat a magnetic material above its Curie temperature, it depolarises and stops being magnetic.
452881
False, because the binding energy increases steeply till iron and again reduces. So I would require enormous accelerators to transmute the element with Z>20.
110024
haven't you seen magnesium burning. sodium burns, potassium burns.\n\nthese metals are very reactive metals owing to the valence electrons in their atoms. they are one electron short of stable octet structure (mg- 2 elec), and so they easily burn\n\nbut other metals are much stable and the oxides of those metals are formed at very high temp and long exposure time but not accompanied by emission of flames.\n\nwood is made of cellulose, which is organic in nature i.e carbon and hence burns to form carbon di oxide (chiefly present in smoke)
31832
Any metal will melt on heating (unless burning up before), but for pure lead the melting point is fairly low with 600K (327°C, or 621°F). The melting point for lead alloys (with tin and/or antimon) is even lower.\n\nEven candle flames emit sufficient heat to melt down lead placed on a spoon in reasonable time.
557678
Ah ha.  Thermite.  Magnesium ribbon would be the usual method to start this reaction.\n\nBe careful with this reaction...
1134140
Depends on the thermoconductive properties of a certain material. Copper for example will heat up or cool down very fast.