Is fusion endothermic or exothermic

Is the heat of fusion endothermic?

is fusion endothermic or exothermic

Heat of fusion, or enthalpy of fusion, is misleading. As energy is extracted from a system to reduce molecular motion, freezing is exothermic.

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We make our world significant by the courage of our questions and by the depth of our answers. Physics Why is fusion beyond iron no longer exothermic? Why is fusion beyond iron no longer exothermic? While the binding energy per nucleon is the highest for iron, total binding energy continues to rise, so it should be possible to gain additional energy by fusing the atom with more hydrogen atoms. Why is it not so? Indeed, fusion of single protons or neutrons onto almost any isotope of any known element is exothermic.

The elements in nature consist of molecules formed from atoms. The atoms are characterised by a positively charged nucleus and by peripheral negative electrons, which determine their species. The mass of the nucleus is less than the sum of the masses of the nucleons protons and neutrons that form it. What about nuclear fuels? The nuclei that have the lowest binding energy per nucleon provide nuclear energy by fusion if they have low atomic mass and by fission if their atomic mass is high. For the same amount of reactants, the energy released during a nuclear reaction is millions of times the energy released during chemical reactions combustion. Home Sitemap Search Info Intranet.

Heat of fusion, or enthalpy of fusion , is misleading. It actually stands for both the freezing and melting processes, and as such, its sign depends on which process we're talking about. As it requires input of energy to induce faster molecular motion, melting is endothermic. As energy is extracted from a system to reduce molecular motion, freezing is exothermic. Is the heat of fusion endothermic? Chemistry Nuclear Chemistry Fission and Fusion.

In nuclear physics and nuclear chemistry , nuclear fusion is a reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles neutrons or protons. The difference in mass between the reactants and products is manifested as either the release or absorption of energy. This difference in mass arises due to the difference in atomic " binding energy " between the atomic nuclei before and after the reaction. Fusion is the process that powers active or " main sequence " stars , or other high magnitude stars. A fusion process that produces a nucleus lighter than iron or nickel will generally yield a net energy release.

By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It only takes a minute to sign up. The term endothermic process describes a process or reaction in which the system absorbs energy from its surroundings; usually, but not always, in the form of heat. The opposite of an endothermic process is an exothermic process, one that releases, "gives out" energy in the form of heat.



Nuclear fusion

We make our world significant by the courage of our questions and by the depth of our answers. Physics Why are both fission and fusion exothermic? -

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2 COMMENTS

  1. Voirenmoge says:







  2. Emil R. says:

    We take advantage of changes between the gas, liquid, and solid states to cool a drink with ice cubes solid to liquid , cool our bodies by perspiration liquid to gas , and cool food inside a refrigerator gas to liquid and vice versa.

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