Are iglus warm and if so why dont they melt?
403258
Igloos inside are warmer than the outside, but this doesn't mean they are above 32ºF.  Since there is no wind inside, heat from the bodies is kept longer (there is little convection) and this creates a samll micro atmosphere inside the igloo. If the air inside goes above 32º, a small layer of ice from the walls can melt, this reduces the temperature close to the walls and again a layer of ice is formed giving back a bit of the internal heat lost during melting.
530330
Ice melting\nWater freezing\nWater boiling\nAmmonium chloride subliming
1014216
The release of CO2 gas in from the pop will make small crystals out of the sugar and syrup solution because of an increase in the freezing point of the solution.  But your freezer is likely to be a bit colder than 3.3 degrees, maybe between 1 and 2.5.
1083390
The water around an iceberg or floe becomes colder than freezing (like putting ice cubes in a drink), but won't turn to ice since it is salty.  And waters in the polar regions are down near freezing to begin with.  When the berg gets sunlight some of the surface will melt off.  When the berg finally drifts to warmer waters, it will melt until it is gone.\n\nFor an example: Take a sink and fill it with water.  Put in some rock salts and stir until dissolved.  Now put in several trays' worth of ice cubes.  Stir.  Some of the cubes will melt since the tap water was not freezing, but eventually the sink water will get to a temperature below 32 degrees F or 0 degrees C without freezing solid.  At that point the coldness of the water keeps the remaining ice cubes frozen and the ice cubes keep the water at a below freezing temp.  Eventually it will melt cause there will be heat absorption into the system raising the water temperature, but it will take awhile.
332731
It doesn't always have to be.  The values for the heat of fusion of ice that you are using were probably found using equipment sensitive to only two significant figures.  I have seen heats of fusion values that have had more than two sig figs, but they were probably found with more sensitive equipment.
331795
your chemistry teacher probably wanted to know the + or - sign, then it should be + because when ice melts, it absorb heat to overcome the van der walls force between its molecules and ice also has high hydrogen bond between its molecules to overcomed. so, ice needs extra energy (heat) and the sign is positive. \nif he/she is asking bout the other sign, then it is the melting part. if heat is released, u can feel the heat on the surface of the material but if heat is absorbed, u can feel the coldness on its surface. if you hold ice in ur hand, it will melt more faster coz the ice absorbs heat from ur hand to overcome its force between bonds ( like i explain above)
160755
depends what depth.\nAt surface around -2degC\ndeeper you go (especially below the halocline) the warmer you get. -2degC is possible because the salt in the water lowers the melting point of ice to ~ -4degC.
1041856
this is a common problem.\n\nPC's generally heat up due to use.  Depending on the kind of laptop you have they may employ a passive cooling method (which tends to have overheating issues)  If your fan does come on that should be alright.  They make things for just this case, an example of one is the Chill Mat:\n\nhttp://www.bestbuy.com/site/olspage.jsp?skuId=6211752&type=product&productCategoryId=cat08006&id=1074788100200\n\nIf your fan stops alltogether then it may be a cause for concern.  No cooling = melting internally
908233
What temperature does your magnets work at and how do u prevent a crash if u loose the refrigerant.
646771
they r cold and they ar hot
630844
Barium sulfate is insoluble, so will not form an electrically conducting solution. It will, however, conduct electricity if molten.  It melts at 1350°C (2462°F). \n\nI hope that helps. If not, please re post.
433410
The filament of a light bulb must become hot enough to emit light without melting.  Copper, aluminim, gold and silver are all very good conductors with relatively low melting points and are not used for filaments.  Tungsten is an excellent filament material because it is a poor conductor resisting current and glows white hot without melting or losing required strength.  Tungsten eventually "boils" away and the filament weakens and has a finite life (which can be lengthened by reducing voltage with a dimmer).  Many materials including carbon can work in a light bulb because all the air (especially oxygen) is removed, otherwise the material would burn up and fail at the very high temperature.
20570
Mercury is a liquid at room temperature but can be changed to a solid if cooled to a low enough temperature or changed to a gas if heated to a high enough temperature.  This is similar to ice, water and steam but at different temperatures.\n\nIf we start with ice kept well below freezing, we can add heat and the ice will rise to the freezing point of water then begin to melt.  Melting occurs because we are adding heat energy to the water molecules which makes them vibrate.  At some point the vibrations are strong enough to break the attractive bonds between the frozen water moleclues which then become liquid.  When the ice is all melted we can add more heat to the water to raise its temperature to the boiling point.  At the boiling point the water molecules are vibrating strongly enough that some of them escape from the surface of the water to form a vapor or steam.  As more heat is added, more molecules escape and the water evaporates.\n\nMany materials, including mercury, exhibit similar solid, liquid and gaseous states depending on the temperature and strength of bonds.
1096750
1st -- tips of the hat to in-janier and lewis_brown for stopping by long enough to give the basic physics and most of all to Lewis for politely informing us that glass is not a liquid.  \n\nGlass is a liquid?  Pull-eeze!  How in the world do you come up with that one, people?  \n\nGlass "flows" -- ???  \n\nGlass flows in liquid state -- only.\n\nGlass is solid until melted.  Then and only then it's liquid.\n\nGlass melts at 2600-2900 °F (1425-1600 °C) depending on its composition.\n\nWhere on Earth do you think glass is liquid or flows at bench temperature?\n\nAnway, I originally stopped by just to ask the asker if he or she could see through black glass (or any other opaque glass)?
980411
No. It would have to be extremely cold before one would crack. I've had them in my vehicle when it got down to -10F and nothing happened.
112334
Air is a good insulator as far as it doesn't circulate. It has low conductivity (about 1,4 Btu/ft h ºF), but if you let the air circulate there can be a very good heat transmission due to convection.\nThat's why insulators try to trap small amounts of air inside, so the air stays immobile.\nVaccumm would be a much better insulator.
65681
None we know of, but keep in mind that the PRESSURE at the earth's core is greater than any pressure we have been able to reproduce, so we don't know for sure the behavior of melting points there. It may be no different. The highest known melting point is for graphite at 6,646.5 F. That's about half the estimated temperature of the core.