what is the highest temperature of superconductors?
363917
The hottest superconductors known to man are the cores of neutron stars.  Estimated temperature 10^9 degrees Kelvin.  Source: www.astro.umd.edu/~miller/nstar.html
686501
It needs a massive amount of energy. Just to give you an idea, the lowest temperature at which one can occur would be 40,000,000ºK (Hydrogen into helium, as on the surface of the Sun).\nAs far as I know, the highest (controlled) temperature we've acheived so far is only about 3,000,000ºK using what's called a tokamak, and it does require A LOT of energy.
339971
"A bolt of lightning can reach temperatures approaching 28,000 kelvins (50,000 degrees Fahrenheit) in a split second. This is about five times hotter than the surface of the sun."  The core of the sun reaches 13.6 MK (about 500 times the temperature reached by lightning).
290402
Yes. Since temperature is a measurement of average kinetic energy of an atom, when you get to the point that atoms disassociate (come apart), you no longer have anything to measure.\n\nHowever, above that certain point, the kinetic energy of a system is measured by particle energy.\n\nIf you look at big bang theories, you will note that the universe began at a high temp, which would probably be the maximum.
661216
If you mean hottest as most POPULAR , then it would be the search for Quantum Gravity ( i.e string theory, loop quantum gravity etc. )\n\nIf you mean hottest as in TEMPERATURE, then it would be the study of the Big Bang, presumably the hottest the universe ( or anything for that matter ) has ever been !\n\nIf you mean coolest as in most INTERESTING, then it would be Nanotechnology, with its many far reaching implications on everyday life.\n\nIf you mean coolest as in TEMPERATURE, then obviously Superconductivity ( which occurs only at very low temperatures ) is THE coolest !\n\nhope this answers your cool question ( no pun intended )
801465
The coldest temperature that anything can reach is –273.15 °C. That is called "absolute zero". On the Kelvin scale, which uses the same divisions as the Celsius scale, it is zero, making the point at which water freezes 273.15 °K. Absolute zero is the point at which all atomic movement ceases, i.e. the atoms no longer move relative to one another.\n\nAny material can be heated or cooled to any temperature, as long as enough energy can be added or removed to do so. Materials left in an environment for long enough will reach the same temperature as their surroundings. This is known as reaching equilibrium with the environment.
686314
"Hot" is a very subjective word.  How "hot" is "hot"? 100 degrees C? 500 degrees C?\n\nWhen an object absorbs heat energy its temperature rises, there is no way around it.  But for a given quanity of heat energy (Q) absorbed, some materials will increase in temperature (delta T) more than others.\n\nThe term "Specific Heat" (c) releates the amount of energy needed to raise 1 gram of a substance 1 degree C.\n\nQ = m*c*(delta T)\nHeat enegry = mass of the object * the specific heat * change in temperature\n\nA higher specific heat means that the material will experience a relatively smaller change in temperature for a given amount of heat as compared to another material with a higher specific heat.\n\nUsually, metals tend to have somewhat low specific heats but there are some metals which are higher than others.\nFor instance,...\n-Iron has a specific heat of .444 J/g degree C\n-Copper has a specific heat of .385 J/g degree C\n-Lithium metal (not that this is a practical building material) has a specific heat of 3.582 J/g degree C\n-liquid water's c = 4.184 J/g degree C\n\nmore complete tables of specific heat can heasily be found on the internet.
994626
1) They require very low temperature, which is very expensive.\n\n2) The ones that work at the highest temperatures (still very cold) are very hard to make into large structures. The small "high-temperature" superconductors that can be made have no practical use.\n\n3) In most electrical applications superconductors would not save much energy so for most purposes there is no point - the three exceptions are powerful magnets, large motors and power transmission lines - reasons 1 and 2 are why they are not used for motors and transmission lines application.\n\n4) Superconductors are used routinely for making very high power electromagnets. In this case the energy savings is great enough to offset the cost of making the exotic superconducting alloy and the cost of refrigeration.
653376
New research is unlocking the amazing potential of high-temperature superconductors.  The special "talent" of superconductors is that they have zero resistance to electric current. Absolutely none. In theory, a loop of HTS wire could carry a circling current forever without even needing a power source to keep it going.\n\nIn normal conductors, such as copper wire, the atoms of the wire impede the free flow of electrons, sapping the current's energy and squandering it as heat.\n\nToday, about 6 to 7% of the electricity generated in the United States gets lost along the way to consumers, partly due to the resistance of transmission lines, according to U.S. Energy Information Agency documents. Replacing these lines with superconducting wire would boost utilities' efficiencies, and would go a long way toward curbing the nation's greenhouse gas emissions. \n\nThese links provide a wealth of information.  I hope they are helpful to you.
459966
Hydrogen has the highest known specific heat of 1.43 x 10^4  J/kg*K at a temperature of 25°C.
52705
I think its because you skipped science at school. The answers were mostly simple and logical.\n\nHow high is up? - As high as you want. I like the reference to upness in the best answer. Good word that.\n\nThe temperature question needs rephrasing. I think you need to use absolute zero as a reference. In which case the temperature is about -231.5 degrees F. This will feel a lot more than twice as cold though, since our temperature sensors in our skin don't work that way.
602468
Absolute Zero or around 20 K.\n\nMelting point 14.01 K  (−259.14 °C, −434.45 °F) \nBoiling point 20.28 K  (−252.87 °C, −423.17 °F)
1069928
Antarctica--in particular, the Russian station Vostok, at which a record-      setting low temperature of one hundred and twenty-eight point six below zero      Fahrenheit was recorded in nineteen eighty-three. \n\n In nineteen-o-eight the university of Leiden      made history by producing the first super-cooled helium. Guess how cold liquid      helium is? \nFour hundred fifty-two degrees below zero Fahrenheit.\nhttp://amos.indiana.edu/library/scripts/coldworld.html
273055
This is my guess:\n\nThe hottest temperature is probably when the particles move at almost the speed of light, I don't know what that is though.\n\nTemperatures can be as high as billions of degrees.\n\nHowever, temperature don't necessarily mean how hot it is, at temperatures of billions of degrees, you could still freeze!
238424
www.superconductors.org
813210
No.\n\nIt is perfectly possible for electricity to flow even at absolute zero - those who think it is not need to revisit their understanding of what thermodynamic temperature is.\n\nSuperconductivity is a very special case, and you cannot form electrical impulses in a superconductor - in fact you cannot change the current flowing in a superconducting circuit at all without introducing a non-superconducting element (usually called a weak link).
134127
I assume that you don't mean local temperature since you could just refer to the local weather report.  Instead one can speak of a theoretical temperature of the Earth based upon its distance from the Sun, size of the Earth and reflectivity (or albeto) of the Earth.  \nThis temperature comes out to about 255K or -18C or -1F.\nOther effects such as greenhouse and radioactivity make this temperature higher.\n\nAn explanation of something like this can be found at the URL in the source.