a pan filled with water is left on an electric coiled stove at its highest setting. water boils off.  what happens to the pan?  does it ever melt?
119487
It would depend on what the pan is made from.  In all likelihood, the stove coil will not generate sufficient heat energy to melt the pan.  Remember that the coil is usually made out of metal alloys as well and would be subject to melting down as well if allowed to get too hot.
490033
It does NOT occur spontaneously.  If it did, you wouldn't need a pilot light in your gas stove of heater!  Combustion takes place by the mechanism of free radicals.  And CH4 won't form any at room temperature.  Once some free radicals are created (by high temp.) the reaction is self-sustaining.\n\nComment on the mention of Pt below:  Yes they DO still do that; but they use either Pt mesh or wire.  That's the way pilotless gas burners work.
340822
In conclusion we found the water to bead up like a dome until the increase in mass/weight overcame the Penny's ability to hold the water. Then the water ran onto the table across the floor. There was a bare electrical wire which the water shorted out and it caught fire, burning the building down. After the Fire Department left, we decide never to try this stupid experiment again!\nYou may want to reword it some, this this best I could do from what you wrote.
513378
Even so water will still evaporate over time if it is in a room with a  high temperature. To obviously stupid answer is somebody drank it!!!
540230
Ether has a higher saturated vapor pressure than water. Thus the former boils at a lower temperature than the latter.
106478
No.  In theory, the cylinder will heat up indefinitely.  However it will likely melt or have imperfect insulation in the real world.\n\nCheck out Conduction of Heat in Solids by Carslaw and Jaeger.  It's a classic book with all of these solutions in it.
162198
Sounds like you've got too much time on your hands to me!  The ions in solution keep the water molecules farther apart from eachother on average than they would be in pure water.  Therefore the hydrogen bonds are weaker and the water will boil at a lower energy level.  At least that's what I'd guess.
466510
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
530743
The pan with the cheesecake ingredients in it is acting as a heat sink for the water.  The air heats the water, keeping it near the boiling point so the water does not start to cool.  The water heats the cheesecake at a temperature slightly below 212 degrees Fahrenheit (as hot as the water will get).\n\nThe water bath is an attempt to provide a more even cooking environment so that the cheesecake does not burn on the edge and remain raw in the middle.\n\nWhile some of the water will evaporate (until the relative humidity of the air in the oven reaches 100%) boiling will not be present until all of the water reaches 212 degrees, and that will not occur until the cheesecake (at least the area near the pan in the water) reaches 212 degrees.  I would not be surprised if the recipe calls for removal prior to that point...
79995
Depending on the damage it could be the pressure isn't being released.  This can lead to a big explosion if it exceeds the pressure limits for the cooker.
124703
water "boils" when the Kinetic energy (energy of motion and heat) cause the molecules of water to expand or separate far enough away that it changes from a liquid to a gas. The greater the force keeping the molecules together, the more energy it needs. On Earth, the force is air pressure. At sea level where the pressure is greatest, water boils at about 100 degrees Celsius. Up in the mountains at 7000 feet it would boil at 80 -90 degrees or even less. In space even the smallest amount of energy would cause it to "boil".\nIt takes one calorie to raise one gram of water one degree Celsius. If you trap the water in a container, you can get the heat of the water much higher than the boiling point. But it could explode if the container is too weak to handle the pressure. So don't try it.
135217
http://newton.ex.ac.uk/teaching/CDHW/egg/\n\nRead the section about "Boiling Eggs on a Mountain." The simple answer is that since the boiling temperature of water drops, you have to cook the egg longer (since the temperature is lower).
243944
The stuff inside is a wax that gets heat up by the bulb on the bottom of the lamp. Wax and water don’t combine so that is why it doesn’t mix. When the wax get hot enough it becomes lighter than water, as it hits the top it cools of and floats on back down.
306792
Try soaking it in boiling water for a few minutes. This should make it pliable again. If this fails, you should try zapping it in the microwave - but only in 10 second bursts as, if you leave it too long, it will melt and will be HELL to remove!
1747
Boiling is very rapid evaporation starting at the bottom of a container of water.\n\nEvaporation occurs fastest where there is the most heat (energy).  When we heat water to make it boil we heat it from the bottom so the evaporation occurs at the bottom of the pot.  As a result, large  bubbles of water vapor form at the bottom and rise to the surface in the boiling action.  If we applied the same heat to the top surface of the water it would evaporate just as quickly but we would not call it boiling because the bubbles would not form and rise to the surface.\n\nNormally evaporation occurs at a much slower rate than boiling because most evaporation occurs with room temperature water.\n\nEvaporation-is the escape of molecules from the liquid state to the gas or vapor state. In evaporation, molecules of higher-than-average kinetic energy escape from a liquid, leaving it cooler than it was before they escaped.\n\nBoiling-is the temperature at which the vapor pressure of a liquid is equal to the \nexternal pressure above the liquid.  When we give the boiling point of a liquid, we \nneed also to state the pressure.
135435
the heat has been conducted by the metal spoon. the thermal heat energy from the water causes the molecules of the metal to vibrate.  These bump into neighbouring molecules, making them vibrate also until the unsubmerged handle is hot. - conduction
117382
Turn the stove on very high heat. \nPlace a frying pan on top of the heat source.\nLet it sit for 5 minutes.\nCrack a egg it the skillet.\nWhat happens next is what is occuring to the brain cells and\nit's capacity to function re: analogy to meth drug usage.