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So far as physics is concerned, time's arrow is a property of entropy alone.
Arthur Eddington
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Interpretation

What this quote means

Time is linked to the increase of disorder in the universe, represented by entropy.

In this quote, Arthur Eddington emphasizes the relationship between time and the concept of entropy in physics. He suggests that the forward direction of time, often referred to as 'time's arrow', is fundamentally tied to the irreversible process of increasing disorder within closed systems, illustrating how physical laws govern our perception of time's progression.

Themes

TimeEntropyPhysicsDisorderChange

In practice

Example use cases

This quote could be used in a lecture on thermodynamics to illustrate the second law of thermodynamics.

More from Arthur Eddington

Whether in the intellectual pursuits of science or in the mystical pursuits of the spirit, the light beckons ahead, and the purpose surging in our nature responds.
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It is one thing for the human mind to extract from the phenomena of nature the laws which it has itself put into them; it may be a far harder thing to extract laws over which it has no control. It is even possible that laws which have not their origin in the mind may be irrational, and we can never succeed in formulating them.
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In the world of physics we watch a shadowgraph performance of the drama of familiar life. The shadow of my elbow rests on the shadow table as the shadow ink flows over the shadow paper. It is all symbolic, and as a symbol the physicist leaves it. ... The frank realisation that physical science is concerned with a world of shadows is one of the most significant of recent advances.
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A star is drawing on some vast reservoir of energy by means unknown to us. This reservoir can scarcely be other than the subatomic energy which, it is known exists abundantly in all matter; we sometimes dream that man will one day learn how to release it and use it for his service. The store is well nigh inexhaustible, if only it could be tapped. There is sufficient in the Sun to maintain its output of heat for 15 billion years.
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