You can easily mix two different colors of fluid together, but you cannot so easily reverse the process and separate the mixture. If you were shown a movie of this mixture unmixing into its original components, through a simple pouring action, you would know that it was not an accurate representation of our physical world: You would know that the movie was running backwards in time, because fluid mixing is an example of an irreversible process. In thermal physics, the concept of irreversibility in such phenomena as heat flow leads toward the concept of entropy and the deep physical understanding that is known as the Second Law of Thermodynamics.

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