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Because the second law of thermodynamics states that any use of energy always results in a decrease in the amount of "useful" energy.

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Q: Why is the conservation of energy an issue that people must deal with if the first law of thermodynamics states energy is not created or destroyed?
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Related questions

Which law of Thermodynamics states that energy cannot be created or destroyed?

That law is known as the Law of Conservation of Energy. It is also known as the First Law of Thermodynamics.


What law states that energy is never created or destroyed?

That is called Conservation of Energy. It is also known as the First Law of Thermodynamics.


What law is Energy is never created or destroyed?

That is called Conservation of Energy. It is also known as the First Law of Thermodynamics.


What states have energy laws that state that energy can not be created or destroyed?

Law of conservation of energy. Energy can't be created or destroyed is the basic statement of the law of conservation of energy.


What law says that energy cannot be created or destroyed only changed?

It is called the First Law of Thermodynamics, sometimes also called The Law of conservation of energy.


Which law states that energy can be neither created nor destroyed?

This law is known mainly with two different names: "Law of Conservation of Energy", or "First Law of Thermodynamics".


The law of conservation of energy states that energy can be created or destroyed as long as it is later converted to a more common form?

No, the Law of Conservation of Energy (a.k.a. First Law of Thermodynamics) states that energy CAN NOT be created or destroyed. Converting energy to a less valuable form is related to the Second Law of Thermodynamics.


What law of the scientific rule states that energy cannot be created or destroyed?

The law of Conversation of Energy


The first law of thermodynamics which is closely related to the law of conservation of energy states that?

energy can be transformed in different ways but can never be created or destroyed.


What is the law stating that energy cannot be created nor destroyed?

it is known as 2 thing the first law of thermodynamics and the law of conservation of energy


Law that states that energy cannot be created or destroyed?

The law of Conservation of Energy. Actually, that law has been superceded now by a slightly different one. Recently (maybe 100 years ago) it was learned that energy can become mass and mass can become energy. So the law had to be modified to say that the total combination of mass and energy can't be created or destroyed.


What scientific principle states that energy can be transferred but that it cannot be created or destroyed?

That is known by two different names: (1) Law of Conservation of Energy, (2) Second Law of Thermodynamics.