Going against the flow

Two of the most extensively-tested laws of physics are the First and Second Laws of Thermodynamics -- and in the nearly two centuries since they were first formulated, there has not been a single exception found.

The First Law is the less shocking one.  It's sometimes called the Law of Conservation of Matter and Energy, and says simply that in a closed system, the total amount of matter and energy does not change.  You can turn one into the other, or change its form, but the total quantity doesn't vary.  Unsurprising, and in fact can seem a little circular given that this is how a closed system is defined in the first place.

The Second Law is where things get interesting.  It can be formulated a variety of ways, but the simplest is that in a closed system, the amount of entropy (disorder) always increases.  If entropy is being decreased somewhere (the system is becoming more orderly) it always requires (1) an input of energy, and (2) that somewhere else entropy is increasing, and that increase is larger than the localized decrease.  An example is the human body.  When you develop from a single fertilized egg cell to an adult, your overall entropy decreases significantly.  But in the process, you are taking the food molecules you eat and (1) extracting their energy, and (2) increasing their entropy monumentally by chopping them up into little pieces and strewing the pieces about.  So you're able to locally decrease your own entropy, but you leave behind a trail of chaos wherever you go.

Or, as my thermodynamics professor in college put it, a lot of years ago: the First Law says you can't win; the Second Law says you can't break even.  Explaining why the United States Patent Office's official policy is that any application that claims to have a working model of a perpetual motion machine goes directly into the trash without being read any further.

The Carnot Heat Engine [Image is in the Public Domain]

All of this is by way of background for a paper that I ran across in Science, called, "Heat Flowing From Cold to Hot Without External Intervention by Using a 'Thermal Inductor," by Andreas Schilling, Xiaofu Zhang, and Olaf Bossen of the University of Zürich.  Because in this paper, the three physicists have demonstrated the passage of heat energy from a colder object to a warmer one, without any external energy input -- something first shown as impossible by French physicist Sadi Carnot in 1824.

The authors write:

The cooling of boiling water all the way down to freezing, by thermally connecting it to a thermal bath held at ambient temperature without external intervention, would be quite unexpected.  We describe the equivalent of a “thermal inductor,” composed of a Peltier element and an electric inductance, which can drive the temperature difference between two bodies to change sign by imposing inertia on the heat flowing between them, and enable continuing heat transfer from the chilling body to its warmer counterpart without the need of an external driving force.

When I read this, I sat up, squinted at my computer screen, and uttered an expression of surprise that I will leave to your imagination.  In my AP Biology class, I always described the Laws of Thermodynamics as two of the most unshakeable laws of science -- two rules that are never, ever broken.  The idea that three scientists in Switzerland had taken a simple Peltier element -- a type of heat pump often found in refrigerators -- and made it run without expending any energy was earthshattering.

But before you dust off your plans for a perpetual motion machine, read the next lines in the paper:

We demonstrate its operation in an experiment and show that the process can pass through a series of quasi-equilibrium states while fully complying with the second law of thermodynamics.  This thermal inductor extends the analogy between electrical and thermal circuits and could serve, with further progress in thermoelectric materials, to cool hot materials well below ambient temperature without external energy supplies or moving parts.

I'm not going to claim I fully understand how this all works, and how despite the system's bizarre behavior it still obeys the Second Law, but apparently the key point is that despite the heat energy flowing the "wrong way," the system still gains entropy overall.

Which, I must say, was a bit of a relief.

It's still a pretty fantastic discovery.  "With this very simple technology, large amounts of hot solid, liquid or gaseous materials could be cooled to well below room temperature without any energy consumption," study co-author Andreas Schilling said, in a press release from Phys.org.  "Theoretically, this experimental device could turn boiling water to ice, without using any energy."

So don't believe any of the hype that I'm already seeing on dubiously-accurate websites, to the effect that "An Exception Has Been Discovered to the Laws of Thermodynamics!  Physicists Dismayed!  Textbooks Will Have to be Rewritten!"  It's a curiosity, sure, and pretty cool, and sounds like it will have a good many applications, but you shouldn't discount everything you learned in physics class quite yet.

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Going against the flow

Two of the most extensively-tested laws of physics are the First and Second Laws of Thermodynamics -- and in the nearly two centuries since they were first formulated, there has not been a single exception found.

The First Law is the less shocking one.  It's sometimes called the Law of Conservation of Matter and Energy, and says simply that in a closed system, the total amount of matter and energy does not change.  You can turn one into the other, or change its form, but the total quantity doesn't vary.  Unsurprising, and in fact can seem a little circular given that this is how a closed system is defined in the first place.

The Second Law is where things get interesting.  It can be formulated a variety of ways, but the simplest is that in a closed system, the amount of entropy (disorder) always increases.  If entropy is being decreased somewhere (the system is becoming more orderly) it always requires (1) an input of energy, and (2) that somewhere else entropy is increasing, and that increase is larger than the localized decrease.  An example is the human body.  When you go from a single fertilized egg cell to an adult, your overall entropy decreases significantly.  But in the process, you are taking the food molecules you eat and (1) extracting their energy, and (2) increasing their entropy monumentally by chopping them up into little pieces and strewing the pieces about.  So you're able to locally decrease your own entropy, but you leave behind a trail of chaos wherever you go.

Or, as my thermodynamics professor in college put it, a lot of years ago: the First Law says you can't win; the Second Law says you can't break even.  Explaining why the United States Patent Office's official policy is that any application that claims to have a working model of a perpetual motion machine goes directly into the trash without being read any further.

The Carnot Heat Engine [Image is in the Public Domain]

All of this is by way of background for a paper that appeared last week in Science, called, "Heat Flowing From Cold to Hot Without External Intervention by Using a 'Thermal Inductor," by Andreas Schilling, Xiaofu Zhang, and Olaf Bossen of the University of Zurich.  Because in this paper, the three physicists have demonstrated the passage of heat energy from a colder object to a warmer one, without any external energy input -- something first shown as impossible by French physicist Sadi Carnot in 1824.

The authors write:

The cooling of boiling water all the way down to freezing, by thermally connecting it to a thermal bath held at ambient temperature without external intervention, would be quite unexpected.  We describe the equivalent of a “thermal inductor,” composed of a Peltier element and an electric inductance, which can drive the temperature difference between two bodies to change sign by imposing inertia on the heat flowing between them, and enable continuing heat transfer from the chilling body to its warmer counterpart without the need of an external driving force.

When I read this, I sat up, squinted at my computer screen, and uttered an expression of surprise that I will leave to your imagination.  In my AP Biology class, I always described the Laws of Thermodynamics as two of the most unshakeable laws of science -- two rules that are never, ever broken.  The idea that three scientists in Switzerland had taken a simple Peltier element -- a type of heat pump often found in refrigerators -- and made it run without expending any energy was earthshattering.

But before you dust off your plans for a perpetual motion machine, read the next lines in the paper:

We demonstrate its operation in an experiment and show that the process can pass through a series of quasi-equilibrium states while fully complying with the second law of thermodynamics.  This thermal inductor extends the analogy between electrical and thermal circuits and could serve, with further progress in thermoelectric materials, to cool hot materials well below ambient temperature without external energy supplies or moving parts.

I'm not going to claim I fully understand how this all works, and how despite the system's bizarre behavior it still obeys the Second Law, but apparently the key point is that despite the heat energy flowing the "wrong way," the system still gains entropy overall.

Which, I must say, was a bit of a relief.

It's still a pretty fantastic discovery.  "With this very simple technology, large amounts of hot solid, liquid or gaseous materials could be cooled to well below room temperature without any energy consumption," study co-author Andreas Schilling said, in a press release from Phys.org. "Theoretically, this experimental device could turn boiling water to ice, without using any energy."

So don't believe any of the hype that I'm already seeing on dubiously-accurate websites, to the effect that "An Exception Has Been Discovered to the Laws of Thermodynamics!  Physicists Dismayed!  Textbooks Will Have to be Rewritten!"  It's a curiosity, sure, and pretty cool, and sounds like it will have a good many applications, but you shouldn't discount everything you learned in physics class quite yet.

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This week's Skeptophilia book recommendation is a classic, and is pure fun: Man Meets Dog by the eminent Austrian zoologist and ethologist Konrad Lorenz.  In it, he looks at every facet of the human/canine relationship, and -- if you're like me -- you'll more than once burst out laughing and say, "Yeah, my dog does that all the time!"

It must be said that (as the book was originally written in 1949) some of what he says about the origins of dogs has been superseded by better information from genetic analysis that was unavailable in Lorenz's time, but most of the rest of his Doggy Psychological Treatise still stands.  And in any case, you'll learn something about how and why your pooches behave the way they do -- and along the way, a bit about human behavior, too.

[Note: If you purchase this book using the image/link below, part of the proceeds goes to support Skeptophilia!]

You can't win, you can't break even

It's bad enough when laypeople misuse scientific terms and are too damn lazy even to read the Wikipedia pages on scientific topics.  What's absolutely maddening is when a science publication does the same thing.

I'm referring to New Scientist, which is no fly-by-night pay-to-play predatory journal, and should surely know better.  It's been around since 1956 and bills itself as the home of cutting-edge research, never shying away from a controversial topic -- but that's no reason to give unwarranted legitimacy to nonsense.

Of course, this isn't the first time they've pulled this sort of crap.  A sensationalized article about the now-discredited "EM Drive" (a thruster that requires no propellant) drew condemnation from a number of sources, leading then-editor Jeremy Webb to state in defense, "this is an ideas magazine—that means writing about hypotheses as well as theories."

That may well be, but "writing about hypotheses" is not the same thing as misrepresenting actual science.  Which is what an article from last week by physicist Paul Davies, called "Life's Secret Ingredient: A Radical Theory About What Makes Things Alive" did, resulting in a lot of bad language and repeated face palms from yours truly.

Okay, let's look at the reasonable stuff first.  It is honestly not simple to determine what we mean by "a living thing;" the various characteristics of life all have exceptions that are clearly considered living by most people (for example, the characteristic of "able to reproduce" is not found in hybrids like mules, and viruses are exceptions to just about the entire list).  The article is basically a long summary of Davies's new book The Demon in the Machine, wherein he proposes that what makes something alive is not the "one or more cells, uses energy, responds to its environment," etc. that you learned in high school biology, but the presence of complex information.

In an interview with The Guardian, Davies explains more fully:

The basic hypothesis is this.  We have fundamental laws of information that bring life into being from an incoherent mish-mash of chemicals.  The remarkable properties we associate with life are not going to come about by accident...  When you look at a living system, the way information is managed is very far from random.  It will show patterns that could lead us to a definition of life.  We talk about informational hallmarks and these might be used to identify life wherever we look for it in the universe.

So far so good.  An interesting idea -- biological complexity as information.  But then Davies says something that made me shout, "You're a physicist!  You should know better than that!"

The fact is, on our current understanding, life is an enigma.  Most strikingly, its organised, self-sustaining complexity seems to fly in the face of the most sacred law of physics, the second law of thermodynamics, which describes a universal tendency towards decay and disorder.

No.  No no no no no.

Life doesn't in any sense "fly in the face" of the Second Law.  The Second Law of Thermodynamics describes what happens in a closed system -- a system in which neither energy nor matter crosses the boundaries.  Your organized, self-sustaining complexity would break down pretty damn fast if I turned you into a closed system.  The fact is, what the Second Law says is that you can decrease entropy locally and temporarily if you meet two conditions: (1) there is a constant input of energy, and (2) the entropy decrease in the system is exceeded by the entropy increase somewhere else.  For example, you have grown from a simple single cell into a highly complex multicellular organism by having a continuous input of energy from your food, but your extraction of that energy has disordered those food molecules completely -- far more than any increase in order in your body.

As my long-ago thermodynamics professor put it: "The First Law of Thermodynamics says you can't win.  The Second Law says you can't break even, either."

I may seem to be overreacting, here, but this is one of the most common things I see on sites devoted to pseudoscientific "proof" that evolution is incorrect.  The creation of ordered living things from a disorderly primordial soup, they say, is prohibited by the Second Law, so requires an Intelligent Designer.  It's the same misunderstanding; complex macromolecules, and later cells, could be formed abiotically because there's a continuous energy source (the Sun).  Turn that off, and things grind to a halt fast.

So my frustration here is that someone who is a trained scientist and an internationally-known writer should not be misrepresenting scientific law.  Especially this one; the First and Second Laws of Thermodynamics are some of the most extensively tested models in all of science, and there has never been a single exception found to either one.  This is why patent applications for perpetual motion machines are thrown away by the United States Patent Office without review.

The Laws of Thermodynamics are strictly enforced in all jurisdictions.

Anyhow, that's today's annoyed rant.  I probably should lighten up, or at least direct my ire toward other more deserving targets.  Heaven knows there are enough of them in our own government.  But really, if you can't count on the scientists to represent things correctly, who can you count on?

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Humans have a morbid fascination with things that are big and powerful and can kill you.  Look at the number of movies made and books written about tornadoes, hurricanes, earthquakes, and volcanoes, not to mention hordes of predatory dinosaurs picking people off the streets.  But in the "horrifically dangerous" category, nothing can beat black holes -- collapsed stars with a gravitational field so strong not even light can escape.  If you fell into one of these things, you'd get "spaghettified" -- stretched by tidal forces into a long, thin streamer of goo -- and every trace of you would be destroyed so thoroughly that they'd not even be theoretically possible to retrieve.

Add to that the fact that because light can't escape them, you can't even see them.  Kind of makes a pack of velociraptors seem tame by comparison, doesn't it?

So no wonder there are astrophysicists who have devoted their lives to studying these beasts.  One of these is Shep Doeleman, whose determination to understand the strangest objects in the universe is the subject of Seth Fletcher's wonderful book Einstein's Shadow: A Black Hole, a Band of Astronomers, and the Quest to See the Unseeable.  It's not comfortable reading -- when you realize how completely insignificant we are on the scale of the universe, it's considerably humbling -- but it'll leave you in awe of how magnificent, how strange, and how beautiful the cosmos is, and amaze you that the human brain is capable of comprehending it.

[If you purchase the book from Amazon using the image/link below, part of the proceeds goes to supporting Skeptophilia!]