why burns caused by steam at 100 deg c are more serious than those caused by water at the same temperature?
143805
Steam has more heat energy in it then water.\n\nDont confuse heat and temperature, they are not the same thing.\nTemperature is the measure of the average kinetic energy of the molecules of a substance.  Heat is a form of energy.\n\nIf both the steam and the liquid water are at 100 degrees C, they are both at the same temperature.  However, in order to boil water into steam, you not only must raise its temperature to 100 degree C, but also supply additional energy, called the "Latent heat of vaporization".  This extra, Latent, heat is the cause of more severe burns.\n\nWhen you want to boil water, you must supply the latent heat, but when water condenses, it gives that energy up.\nAs the steam consense, your body absorbs that latent heat, but then it also absorbs energy from the 100 degree water that just formed.
771844
A\n\nVolcanic explosions such as St. Helen's are cause by super heat gases.  Often Steam.
48024
Your question doesn't make sense.  No metal would produce heat by being put in hot water--heat is only produced by a chemical change.  Perhaps sodium metal, which would conbust if the water had any oxygen in it, but it wouldn't need to even be hot water.  Also, water wouldn't be water at 400 degrees.
737912
because steam is hotter and more pervasive
587903
Steam isn't "hotter", it's still at 100°.  What it has though is more heat energy in it kg for kg.  The extra energy is the heat of vaporization and it's the reason the steam takes up so much more volume than the water at the same temperature.  The water molecules have the same average kenetic energy - temperature - but they occupy much less space.
902589
Wow. There are a lot of bad answers here. For a given mass, steam will have more energy than water. The difference is called the 'heat of vaporization'. One thing to be carefuls about, of course, is that a given mass of steam will occupy much more volume than the same mass of water.
276889
Did you happen to forget the "in" between burn and the? If thats the case, its because the oil at that time is alot hotter then the water's boiling point, so when water is introduced, it rapidly boils and boils away.
745608
liquid...at 0 C it would be frozen and at 100 C it would be gas, since 75 is not yet boiling, the water would still be liquid
341668
Water evaporates at 100 degrees, celsius, so the liquid water you touched wouldn't be any hotter than that. The metal, on the other hand, does not. So it would be as hot as the object which is heating it.
153127
Nothing.  Except have a lower water volume due to warmer water molecules converting to gas.  However, the warmer water may have an efffect on the plants you are studying.  If you water a plant with hot water it may kill the plant.
929239
because hot water has more energy than cold, giving the molecules more energy to move(melt)faster\n\n (i am trying to get to level 2 best answerer would help)
635522
It depends on the liquid AND the pressure. 100C is for water at atmospheric pressure.
264462
Because steam is hotter than boiling water.
931030
That should only happen with copper or copper salts.\nIt's the oxidation of the copper in the flame.\nAll elements burn differently, this is the basis of how a spectrometer works.
308806
Consider a liquid (water) and its gas (steam).  To convert water to steam, you first have to heat water to 100 C.  At that point additional energy begins to boil the water.  This is the process where water molecules have enough energy to overcome the attractive force between them (called cohesion, in this case, due to the dipolar attraction between waters).\n\nYou are right in that gases are higher energy (could say hotter), but that's because they've taken the energy from whatever heat source was around when they vaporized.\n\nBack to the water example, water on your skin feels cold because it's absorbing heat from your skin and as the water evaporates, that heat is carried away by the vapor phase molecules (which are moving faster than the liquid form).\n\nThe fast-moving particles from your question have a lot of heat stored, that's why steam at 100 C is more likely to burn your skin than water at 100 C.  It has more heat to transfer.\n\nAs for freon, it depends on which freon you're talking about.  Freon 12 (one of the ones phased out because of ozone depletion) melts at -158 C (Merck Index).
756704
well i guess it would be anything under the bloods boiling point which is approx. 0.158 degrees centigrade. but of course it might still burn..i myself like hot water so i've bathed in water that had smoke rising from it and my skin turned red...is that hot or what! lol
111874
Once something has already burned, it will not burn again. Water is the result of hydrogen burning.