BasicMistake
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This has cropped up a lot recently and after researching it, it still isn't particularly clear.

It seems that it refers to the different energy levels of a molecule in physics but in a greater context, it seems to relate to things become disordered.

Here's a Brian Cox video about entropy that I watched:
https://www.youtube.com/watch?v=uQSoaiubuA0

Can someone explain the different interpretations of 'entropy'?
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Flame Alchemist
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Primarily, entropy is a thermodynamic concept. It essentially means disorder, like you said. You know how perpetual motion is impossible? How 100% efficiency is never truly obtainable? That's because in any process, some amount of energy is always lost to disorder in a non-useful state (the phrase 'energy lost as heat' crops up endlessly).

Entropy essentially dictates the arrow of time. In any system, entropy always increases. Eventually, any system will reach a state of thermodynamic equilibrium - a state of maximum entropy - wherein all energy has been 'lost' to the state that there are no longer any energy differentials and, hence, no processes of any kind. This is one possible fate of the universe: heat death.

The concept of entropy has more specialised application in chemistry with regard to molecular arrangements etc. but what I've outlined is a simplified view of the underlying theory.
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BasicMistake
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(Original post by sjgriffiths)
Primarily, entropy is a thermodynamic concept. It essentially means disorder, like you said. You know how perpetual motion is impossible? How 100% efficiency is never truly obtainable? That's because in any process, some amount of energy is always lost to disorder in a non-useful state (the phrase 'energy lost as heat' crops up endlessly).

Entropy essentially dictates the arrow of time. In any system, entropy always increases. Eventually, any system will reach a state of thermodynamic equilibrium - a state of maximum entropy - wherein all energy has been 'lost' to the state that there are no longer any energy differentials and, hence, no processes of any kind. This is one possible fate of the universe: heat death.

The concept of entropy has more specialised application in chemistry with regard to molecular arrangements etc. but what I've outlined is a simplified view of the underlying theory.
Thanks, that really cleared it up
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