Imagining a demon that could disrupt the flow forces physicists to contemplate what the second law actually means. Via WIREDUK
In addition, the second law of thermodynamics signifies the statistical nature of the universe. Its building blocks are not stars, planets, humans, or bacteria—they’re the atoms and molecules that make us up. You can think of the atoms in the universe as a deck of cards, constantly being shuffled and reshuffled. By the end of the reshuffling, the deck will have no semblance of order.
Ultimately, the second law of thermodynamics says that energy moves around in nature to increase entropy. “If you ask what physics is, you might just say it is the study of energy,” says Leff. “What’s happening as far as I can see is that energy keeps redistributing itself.” However, as people invent new technology, it’s not always clear how the second law applies. For example, seemingly straightforward concepts like temperature get complicated. Naert’s steel beads are at room temperature in the conventional sense, defined according to the average speed of their constituent molecules. This is the same temperature that you might associate with how it would feel to touch the bead.
In addition, physicists have had to revisit the second law as researchers build smaller and smaller devices, such as
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