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Can energy/mass be created? If doesn't, how has it come to exist? If does, how can it be achieved?
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According to the Law of Conservation of Energy and the Law of Conservation of Mass, energy and mass cannot be created or destroyed. They can only be transformed from one form to another.
Nuclear fusion is the process of combining two or more atomic nuclei to form a heavier nucleus. This process releases a tremendous amount of energy, as predicted by Einstein's famous equation, E=mc^2. The mass of the resulting nucleus is slightly less than the combined mass of the original nuclei, with the "missing" mass being converted into energy.
While we cannot create matter from pure energy, we can convert energy into matter through nuclear reactions. This process is known as pair production, where high-energy photons can transform into an electron and its antiparticle, a positron.
The principle of energy conservation states that energy can be transformed from one form to another, but the total amount of energy remains constant. However, some energy transformations are more efficient than others. For example, potential energy can be converted to kinetic energy with a high efficiency, while thermal energy is often considered a "low-quality" energy that is difficult to convert into other forms.
No, it is not possible to create energy from nothing. The first law of thermodynamics states that energy cannot be created or destroyed, only transformed. This means that energy must always come from a source, such as the sun, fossil fuels, or nuclear reactions.