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Chapter 19: Problem 11

Energy is conserved, so why can't we recycle it as we do materials?

Short Answer

Expert verified
Though energy is conserved, it cannot be recycled in the same way as materials due to its degradation in quality with each transformation or transfer, as explained by the second law of thermodynamics. Each time energy changes form, some of it is converted into a less useful form, typically heat, which is not fully recoverable or reusable.

Step by step solution

01

Conservation of Energy

According to the first law of thermodynamics, energy cannot be created or destroyed, only transferred or transformed. This is known as energy conservation. It means that the total quantity of energy in a closed system remains constant.
02

Transformation and Degradation of Energy

Although the total amount of energy is conserved, each time it is transferred or transformed, some of it is converted into a form that is less useful, typically heat. This is explained by the second law of thermodynamics, which states that the entropy of an isolated system always increases. In other words, energy tends to spread out and become less concentrated, reducing its potential for doing work.
03

Energy Recycling Limitations

These principles make energy recycling different from material recycling. While materials can be collected and reprocessed into new products, reusing energy is not as straightforward. The degradation of energy quality implies that a part of the energy becomes unavailable for doing work. Although the heat energy can be partly captured and reused in some processes (like in heat engines or co-generation systems), a portion of it will inevitably be lost.

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