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It is an observed fact of nature, known for at least a hundred years now. There are no known processes that can create energy where there was none before.

As to the reason, it is quite complicated. Basically, it is related to Nöther's Theorem. Every conservation law is related to a law of symmetry in nature. In the case of conservation of energy, it is related to the fact that the laws of nature don't change over time. In other words, if energy could be created or destroyed, then the laws of nature would be changing all the time! Please note that the math required to understand the details is quite complicated.

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Q: Why can energy neither be created nor destroyed?
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Related questions

What is neither created nor destroyed in a chemical change?

Energy is neither created or destroyed.


What does it mean that energy is neither created nor destroyed?

Energy is cannot be created nor destroyed it can only be moved.


In any physical or chemical process energy is neither created nor destroyed?

Energy is neither created nor destroid because energy is transfer from one form into another


Is it true that energy can be created or destroyed?

No. The first law of thermodynamics states that energy may be neither created nor destroyed.


What the law of conservation of energy means?

It means that energy can neither be created nor destroyed.


What does the law of conservation of energy means?

It means that energy can neither be created nor destroyed.


Energy can be neither created nor destroyed by ordinary means?

Yes, this is right.


What does law conservation of energy state?

In a closed system, energy can neither be created nor destroyed.


What state of law of conservation of energy?

In a closed system, energy can neither be created nor destroyed.


What energy is not created or destroyed?

matter. In one of the sciency laws it clearly states that matter is neither created nor destroyed.


Who discovered the Law of Coservation of Energy?

a matter that cant be created or destroyed. it can change form but have a fixed volume.


Charge is neither created nor destroyed it is?

When something is neither created nor destroyed, it is said to be a CONSERVED quantity.