Why is nuclear fusion not currently used as an energy souce on earth?
We do not currently have the technical knowledge to produce controlled fusion reactors on a scale large enough to produce power. Right now, the only two viable uses of fusion are in the Sun, and in hydrogen bombs, but the latter is an uncontrolled reaction, not suited for use in a power plant.
The problem is that, in order to produce a fusion reaction, you need extremely high temperatures and pressures. That's easy for the Sun to do, because of its enormous mass and gravity, but on Earth it is a problem.
Once you have that fusion reaction going, then you need a way to contain it. Unfortunately, there is nothing that can hold the plasma needed for the fusion reaction, because it will burn through anything.
Since plasma is a charged stream, we can use magnetic fields to bottle it, so to speak, but in order to produce a strong enough magnetic field, we often need to use super-conducting magnets, which means very, very cold temperatures.
The conflict is that we need to maintain pressure and ultra high temperature in close proximity to super-cold temperatures. We just have not been able to accomplish that other than in very, very tiny experiments, with monstrously large machines.
Work is ongoing in various labs to attempt this, but I am going to guess that, without the benefit of some stupendous discovery, we are at least 50 or 100 years away from being able to sustain a controlled fusion reaction in a size sufficient to generate commercial power.
Nuclear fusion produces energy because the binding energy of the nucleons in the resulting nucleus is greater than in the starting nuclei. The same happens when a heavy nucleus, U235 or Pu239 for example, splits up. These are both examples of nuclear energy, but as we have not yet learned how to use fusion for power production, useful nuclear energy on earth is only available from fission.
Nuclear fusion has not yet been achieved on Earth but it is the process by which the un and stars are believed to gain their energy. At the moment nuclear reactors use nuclear fission, which is the splitting of radioactive nucleii. Nuclear fussion is the combining, or the fusion, of atoms which would release much much more energy. Many scientists believe that this is the way we need to go to solve the energy crisis.
Nuclear energy ocurs in stars, it is the mechanism that enables stars to produce energy. This is true for our sun. All the energy we receive from the sun is because nuclear fusion is occurring in the sun. Nuclear energy does not ocur on earth, except in nuclear reactors and in nuclear weapons when they are tested.
It takes tremendous heat and pressure to get nuclear fusion to occur. This heat and pressure is typically available in the cores of sufficiently massive stars. We have produced fusion reactions on earth by surrounding hydrogen isotopes with fission bombs. The heat and pressure cause the gas to fuse, liberating even more energy. We are getting close to designing a workable fusion reactor. When we achieve this, there is sufficient deuterium (a heavy isotope of…
Yes, nuclear fusion reactions provide nuclear power. But here on earth, we haven't mastered a large scale nuclear fusion power reactor. We can only generate nuclear fusion reactions in a high energy physics lab or in the detonation of a fusion nuclear weapon. Make a note, however, to realize that our sun and most other stars use nuclear fusion to generate their massive power outputs.
Problem on nuclear fusion is upon confinement of reaction in earth atmosphere. Nuclear fusion required very high temperature to initiate the reaction. Sustaining reaction is not easy. It is likely the earliest nuclear fusion will be available commercially by 2050. It is a little far future for the current energy crisis would reach it peak around 2040.
Nuclear fusion is the opposite of fission. Rather than using uranium or other rare earth metals, Nuclear fusion involves the combining of two hydrogen atoms into a single helium atom. Fusion doesn't create dangerous nuclear wastes and uses a highly abundant element (hydrogen). Comparable to the sun's energy, fusion creates much more energy that nuclear fission, but as of now, scientists cannot sustain it for more that a few seconds due to the specific conditions…
I will give you 2 answers. First and most correctly, 0%. We have not found a way to initiate and control fusion energy in a way that is economically viable. The control part is key. An example of an uncontrolled nuclear fusion reation is the Hydrogen Bomb. Second the smart ass answr, since the sun supplies most of the energy to the earth, which plants used and had become oil, most of our energy comes…
Nuclear energy means energy obtained from changes in the nucleus, which is nuclear fission on earth and fusion in stars (possibly on earth in the distant future). Radioactivity is also a nuclear phenomenen which can give small amounts of useful energy. When you move to the atomic level you are dealing in Chemistry rather than Nuclear Physics, and some chemical reactions give out energy, most notably the burning of fossil fuels with oxygen.
the nuclear fusion reaction has not been made possible on earth yet, but the nuclear fusion reaction taking place inside the sun( i mean to say solar energy) can be made to work for the car, all you need to have is solar panel, which can be use to charge up the battery of the car.. or if you have a electric car.. you can run the car free of cost with the help of…