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Because the nuclei involved have to be squeezed very hard together, to overcome the repulsion that similar charges naturally have for each other (ie electrostatic repulsion). In fact in experiments on earth with tokamaks, the pressure is not high but temperatures have to be made extremely high, higher than in stars where pressure at the star's centre is very much higher than can be achieved on earth. This is to encourage the nuclei to get close enough for fusion to occur, but so far on earth only short bursts of fusion have been achieved, whereas the sun has been burning for billions of years.
What else can I help you with?
The amount of heat necessary to change 1 kg of a solid into a liquid at the same temperature is called the?
molar heat of fusion
What F-word is defined as nuclear reaction in physics?
The word you're looking for is... Fusion
If fusion could provide earth with clean energy for thousands of generations why don't we start using it now?
The problem is that, although there are a range of different techniques for fusion, most of them produce less energy than is required to sustain the reaction. The most promising systems are "hot" reactors. The reaction takes place under conditions of very high temperature and pressure and it is difficult to safely contain such reactions. There are plans to build a prototype reactor that will produce a net energy output for "many minutes" but, alas, we are several years (possibly many years) from commercial fusion power stations.
Energy is released when smaller nuclei join to form a larger nucleus in a process called what?
Nuclear fusion
What is the process that A star turns matter into energy?
A nuclear reaction - either fusion or fission - is required to turn matter into energy.
What two things are necessary for fusion reaction to take place in a star?
High temperature and high pressure are necessary for fusion reactions to take place in a star. The high temperature is needed to overcome the electrostatic repulsion between positively charged atomic nuclei, while the high pressure is needed to confine the high temperature plasma.
Does the nuclear fusion occurs at the surface of the sun?
Fusion takes place in the core, where the temperature and pressure are much higher, which is necessary for fusion.
What is the temperature in a hydrogen bomb?
At the instant of detonation, the temperature at the core of the fusion reaction is high enough for the fusion of deuterium with tritium, and of tritium with tritium (50,000,000°C and 400,000,000°C, respectively.
What is one obstacle that is used in nuclear fusion?
temperature/pressure needed to start reaction.
How hot does a fusion reaction have to be?
The basic answer is that nuclear fusion can only occur at VERY high temperatures like MILLIONS of degrees. You can relate it to the sun where the sun is around 10mil degrees and bonds hydrogen atoms to form helium.
The amount of heat necessary to change 1 kg of a solid into a liquid at the same temperature is called the?
molar heat of fusion
I am what is being investigated to contain fusion reaction?
You are most likely referring to a magnetic confinement fusion device, such as a tokamak or a stellarator. These devices use powerful magnetic fields to confine and control high-temperature plasma, enabling the conditions necessary for a controlled fusion reaction to occur. Scientists and researchers study and investigate these devices in order to develop a viable and sustainable method of achieving nuclear fusion as a clean and abundant source of energy.
When does thermonuclear fusion reaction start?
In stars it starts due to the great pressure at the star's center, which compresses the hydrogen and raises temperature to a condition where fusion commences. On Earth in man made equipment such as tokamaks, the pressure is much lower and the temperature has to be raised to hundreds of millions of degC to start fusion in a plasma of deuterium and tritium
Can nuclear fusion be controlled in the laboratory?
basically fusion reaction needs high temperature ,now a days number of experiment can be done on it ,according to scientists laser can creat such a large temperature,also we can use catalyst .
What type of nuclear reaction takes place in stars?
Nuclear fusion is the type of nuclear reaction that occurs in stars. Older stars with a collapsing center can exceed a temperature of one hundred million Kelvin.
What is the major problem with fusion reactions as an energy source?
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.
Is nuclear chain reaction is called fusion?
No, a nuclear chain reaction refers to a self-sustaining series of nuclear fissions where the neutrons released in one reaction cause further fissions. Fusion, on the other hand, is the process of combining two light atomic nuclei to form a heavier nucleus, releasing large amounts of energy in the process.
