In auto defrost refrigerators why the ice in ice-trays does not melt?
372400
Automatic defrosters remove ice through sublimation.  The ice-cubes actually get smaller;  they do not come through the process unscathed.
453393
Yes.  That's why the evaporator coils of a refrigerator or freezer get frosted.
563136
Depends how well air can get between ice and tray. Easiest way to lubricate the ice is to flush the back of the tray with hot water. The ice cubes will melt on the surface, and the water film allows them to slip out.
613215
Simply put, the salt lowers the freezing point of water.\n\nHow does it do this?  From kinetic molecular theory, the temperature of an object is proportional to the random motion of the molecules of the object.  As water cools down the molecules move slower and stick closer together until the intermolecular forces are stong enough to lock the molecules into a crystal structure (overcome random motion) and water freezes.  The salt lowers these intermolecular forces by interacting with the water molecules: there is some salt-water interaction and thus less water-water interaction.  Thus, a lower temperature is required to lock in the crystal structure (lower melting point) and the ice melts.\n\nThis works to about -30 or -40 C IIRC.
1047534
Ice expands during the freezing process by blending with air.. but when frozen it is one of the very few things that goes through a process called sublimination .. straight to vapor form from solid without being a liquid in between.. this is why ice cubes shrink over time when left in the freezer for long periods.. pretty cool stuff \n.. damn, I actually remembered something from high school .. haaa
504847
It gets colder. So clearly not isothermal (which means it stays the same temperature). It's adiabatic because no energy is released or absorbed.
108107
umm...ice will never melt snow. As in ever.
5352
This is a simple and complex question all in one.  I was a chemical engineer before I became a registered nurse and believe me, this could have a very detailed and complex answer to it.  However, I will simply say that it is due to the other compounds in tap water that affect the melting of ice.  Water and ice have been studied extensively and just about any website dealing with chemistry would be able to help you with this question.  If you want something very detailed, let me know.
718611
The soda has more heat than the ice.  Heat energy travels from areas of greater heat to lesser heat.  The heat energy in the soda leaves the soda to go to the ice which in turn melts the ice, and leaves behind a cooler soda.\n\nHeat moves....cold doesn't.
836069
Cold falls so the cold created in the freezer helps to keep the fridge part cool also.\n\nCoach
57410
Water/Ice changes state from solid to liquid when it's temperature rises or it's pressure rises.  So heating ice (obviously) melts it, and so does applying pressure (that's how an ice skate works; the pressure from the blade melts a thin layer of ice; the blade then "skates" on a thin layer of liquid water trapped in the ice grove.  This water soon re-freezes after the skater passes).  Of the two, applying heat is generally more effective then applying pressure.\n\nAnother method is to change the water/ice to something else that melts at a lower temperature.  Salt water has lower temperature freezing poing than pure water, so adding salt to ice can cause it to melt.  Ice cream freezers do this, and that's why salts (and similar chemicals) are put on frozen road surfaces.\n\nIn interesting way to heat a large area of ice outdoors is to put a dark coating over it.  Normally, ice reflects sunlight, so the sun does an inefficient job of heating and melting ice.  If you put black dust, dirt, paint, plastic, sand, or something else over it, then the black substance will absorb the sun's enegery and prevent it from being reflected away.  This trapped heat will then melt the ice much faster than if the sun were shinning directly on the ice.
1084672
Refrigerators are not magnetized.  Their doors are made of steel.  \n\nIf it was magnetized your flatware would stick to it too (unless you have stainless steel flatware).  Magentized means it asts like a magnet.\n\nNo, it is not required for the fridge to work, and no it doesn't make the fridge cold.  Freon and an air compressor make the fridge cold, and plugging it in makes it work.
384592
when you pour water on the ice, the ice has layer of water around it, but its still really cold. when the new water stays next to it, the ice cube freezes the water around it, if two ice cubes are touching, they will freeze the water between them and stick to eachother
1052359
Easy, every substance has a melting/freezing point. Just because substances are in a liquid state at... room temperature (25 celcius), doesnt mean that one wont freeze at 20 Celcius and another at... -15 Celcius make sense right? \n\nWell when you disolve things into a liquid (which are at that point called electrolites I believe, the things you disolve into the liquid that is) you change the freezing point of that liquid. \n\nFor example water, plain freshwater freezes at 32 Ferinheight, but you add 3% salt to it and you have saltwater right. And the freezing point of saltwater which only has a very little bit of salt in it now freezes at around 0 Ferinheight.\n\nSo iced tea has a bunch of crap added to it so it could very easy change the temperature that that specific liquid freezes. \n\nAnother very important note is that if it is in the back of the fridge, then that is where it could easily be below 30 degrees and it could freeze up. It is way colder in the back of the fridge then in the front.
625534
Everything goes from solid to whatever else one molecule at a time. It's just that under certain conditions, there is a spread between the energy that it takes to get away from the solid and the energy that it takes to exist as a gas. So, when you melt ice under one set of conditions, the molecules only have enough energy to break free from the ice crystals and go into solution. But, if the pressure is very low (outer space say) then that same amount of energy is enough to drive the water molecules into the gaseous phase instead.
12436
Water vapor that has frozen.\nTidbit: Snow doesn't melt - it vaporizes, turning back into vapor as it heats up.
268206
You can use dry ice, which is solid frozen carbon dioxide, around the ice cube to keep it cool sot hat it will not melt.\nBecause of its particular characteristics, dry ice requires special precautions when handling. It is extremely cold and there should be no direct contact with skin.\nIt is constantly sublimating to carbon dioxide gas, so it cannot be stored in a sealed container as the pressure buildup will quickly cause the container to explode.\nWith these precautions, using dry ice is the most effective way of ensuring that the ice cube won't melt.