What is the definition of the latent heat of fusion?
440917
Ok the Latent heat mean the amount of heat energy that you have to put into a substance that will make a change of state but not raise the temperture of it.
27210
im not sure of the exact curve.  but i know you have take in account the heat of fusion (the energy it takes to convert ice to liquid water, where the temperature stays the same, 0 degrees celsius, even though energy is being added)  and the heat of vaporization (the energy it takes to convert liquid water into steam, where the temperature remains the same, 100 degrees celsius, even though energy is being added)
1052558
In freezing, the latent heat of fusion in the water molecules is released with out the water changing its temperature. The molecules lose average kinetic energy, and start behaving like particles in a solid, with minimal vibrational movements and close seperations. The reverse process is melting, where latent heat of fusion is absorbed by the water molecules, increasing average kinetic energy which is used to break bonds between molecules so they start behaving like particles in a fluid.\n\nThe transition from liquid to vapour, and vice versa follows a similar path, except the heat energy required for the process is in this case called latent heat of vaporisation.
911413
Nuclear fusion is what you are talking about.  Basically smaller atoms (hydrogen for example) are smashed together under high energy to form larger atoms (helium for example).  In the process, a small amount of energy is given off.  This is the process that powers the sun, and if we could harness it, it would make a great source of electricity.  Anyway they have experimental fusion reactors, they just take in more energy then they give out making using them as a power source pointless.  They're working on that though.  Someday hopefully they can make a fusion reactor that gives off more energy then it takes in.
106996
Currently we are using nuclear FISSION (splitting) in all nuclear reactors of the world. The only problem is all the waste fission produces (radioactive waste whose half-life is one-million years!). Because FUSION (fusing) involves combining, it produces no waste whatsoever. The only problem is that fusion requires MASS amounts of energy (via heat), so in the end, more energy is used than is created. Because it is almost impossible to receive benefit from heat fusion, scientists are currently working on COLD FUSION (requires little energy), but nothing of significance has developed yet. \n\nSo all in all the cost of nuclear fusion is that it requires too much and provides too little.
846365
Thermal energy IS heat.
546552
It is called latent heat or the amount of heat required to change phases.  The latent heat of vaporization is usually much great than that of freezing.\n\nEach chemical or molecule has a different latent heat to change from liquid to gas.  It is also interesting that when water vapor condenses into liquid water, it gives off the exact same amount of energy that it took to boil it.\n\nNow think of dry ice (frozen carbon dioxide).  It goes straight from solid to gas (sublimation) and think about how much of a kick (freezing power) it has.
136409
Atomic fusion relates to the release of radiation poweras the result of atomic synthesis.Its is really a Mass defect Phenomena.Experiment have been made to extract Power out of the Process.This required high magnetic field and temperatures.The results have been stale mates.\n\nCold Fusion involves a process at lower temperatures.\nSo far there has been no experiments which were made to be able to obtain  Radiation power. \n\nNuclear fusion would solve our world's energy crisis with no radiactive pollution.\nWE have not being able to make it work yet.\n\nIt Cold fusion may never be realized.The future for that process looks very dim.
391725
In physics, nuclear fusion is the process by which multiple nuclei join together to form a heavier nucleus. It is accompanied by the release or absorption of energy depending on the masses of the nuclei involved. Iron and nickel nuclei have the largest binding energies per nucleon of all nuclei and therefore are the most stable. The fusion of two nuclei lighter than iron or nickel generally releases energy while the fusion of nuclei heavier than them absorbs energy; vice-versa for the reverse process, nuclear fission.\n\nNuclear fusion of light elements releases the energy that causes stars to shine and hydrogen bombs to explode. Nuclear fusion of heavy elements (absorbing energy) occurs in the extremely high-energy conditions of supernova explosions. Nuclear fusion in stars and supernovae is the primary process by which new natural elements are created. It is this reaction that is harnessed in fusion power.\n\nIt takes considerable energy to force nuclei to fuse, even those of the least massive element, hydrogen. But the fusion of lighter nuclei, which creates a heavier nucleus and a free neutron, will generally release more energy than it took to force them together — an exothermic process that can produce self-sustaining reactions.\n\nThe energy released in most nuclear reactions is much larger than that for chemical reactions, because the binding energy that holds a nucleus together is far greater than the energy that holds electrons to a nucleus. For example, the ionization energy gained by adding an electron to a hydrogen nucleus is 13.6 electron volts -- less than one-millionth of the 17 MeV released in the D-T (deuterium-tritium) reaction shown to the top right.\n\nThe steps of the main cycle of nuclear fusion in stars were worked out by Hans Bethe.
514251
When the energy cells of the light(photons) get converged and shape a single heat point(power point)  by the lense . The temperature at that ponint rises and depending on the degree of the heat and the target material , which is here paper it make the ignition and then Fire shines.
799142
Hi Kitty,\nHere is what, I think, you need.\n\nExothermic, dH < 0, Entropy increases (dS > 0), Reaction is spontaneous and dG < 0\n\nExothermic, dH < 0, Entropy decreases (dS < 0), Reaction is spontaneous only at low temps, if |T dS| < |dH|\n\nEndothermic, dH > 0, Entropy increases (dS > 0), Reaction is spontaneous only  at high temps, if T dS > dH\n\nEndothermic, dH > 0, Entropy decreases (dS < 0), Reaction is not spontaneous, dG > 0
77567
Cold fusion has not been achieved.  Someone is pulling your leg about that.  "Hot" fusion reactions have been achieved in the lab, but only under very limited circumstances, not sustainable, and not at the break-even point in terms of energy production.
328894
A potential answer would be the Positron (the electron's antiparticle)\n\nFor a "normal" 4H->1He fusion cycle it really depends, there are several paths that it can take, but for the sake of argument let's look at the one most common in the sun.  The excess mass that 4 hydrogen nuclei have over 1 helium nuclei is converted into energy.  Some of that energy is carried off in gamma rays - ready to use light energy, that will then interact and heat the surroundings.\n\nSome of that mass-energy is given off in positrons.  These are the anti-particle to the electron.  These particles will quickly meet up with an electron, and mutually anhilate relesing energy equal to their combined mass.  Some of the energy is carried of by neutrinos.  They don't anhilate and thus leave the system quite rapidly.
844942
Phase - gas \nDensity  (0 °C, 101.325 kPa)\n9.73 g/L \nMelting point  202 K\n(-71 °C, -96 °F) \nBoiling point 211.3 K\n(-61.7 °C, -79.1 °F) \nCritical point 377 K, 6.28 MPa \nHeat of fusion 3.247 kJ·mol−1 \nHeat of vaporization 18.10 kJ·mol−1 \nHeat capacity (25 °C) 20.786 J·mol−1·K−1 \nVapor pressure P/Pa 1 10 100 1 k 10 k 100 k \nat T/K 110 121 134 152 176 211 \n \nAtomic properties \nCrystal structure cubic face centered \nOxidation states 0 \nElectronegativity no data (Pauling scale) \nIonization energies 1st: 1037 kJ/mol \nAtomic radius (calc.) 120 pm \nCovalent radius 145 pm \nMiscellaneous \nMagnetic ordering non-magnetic \nThermal conductivity (300 K) 3.61 mW·m−1·K−1 \nCAS registry number 10043-92-2 \nSelected isotopes \nIsotopes of radon iso NA half-life DM DE (MeV) DP \n211Rn syn 14.6 h Epsilon 2.892 211At \nAlpha 5.965 207Po \n222Rn 100% 3.824 d Alpha 5.590 218Po \n \n\n\nthis is what wikipedia had to say. hope it helps!
762680
its heat; radiators give off heat and so does the friction caused by moving atoms
39424
heat is the measurement of thermal energy
406343
it's heat absorbed or radiated during a change of a phase at constant temperature/pressure.