logo
episode-header-image
Dec 2004
27m 34s

The Second Law of Thermodynamics

Bbc Radio 4
About this episode

Melvyn Bragg and guests discuss the Second Law of Thermodynamics which can be very simply stated like this: "Energy spontaneously tends to flow from being concentrated in one place to becoming diffused and spread out". It was first formulated – derived from ideas first put forward by Lord Kelvin - to explain how a steam engine worked, it can explain why a cup of tea goes cold if you don't drink it and how a pan of water can be heated to boil an egg.But its application has been found to be rather grander than this. The Second Law is now used to explain the big bang, the expansion of the cosmos and even suggests our inexorable passage through time towards the 'heat death' of the universe. It's been called the most fundamental law in all of science, and CP Snow in his Two Cultures wrote: "Not knowing the Second Law of Thermodynamics is like never having read a work of Shakespeare".What is the Second Law? What are its implications for time and energy in the universe, and does it tend to be refuted by the existence of life and the theory of evolution?With John Gribbin, Visiting Fellow in Astronomy at the University of Sussex; Peter Atkins, Professor of Chemistry at Oxford University; Monica Grady, Head of Petrology and Meteoritics at the Natural History Museum.

Up next
Aug 21
Germinal (Archive Episode)
Melvyn Bragg and guests discuss Emile Zola's greatest literary success, his thirteenth novel in a series exploring the extended Rougon-Macquart family. The relative here is Etienne Lantier, already known to Zola’s readers as one of the blighted branch of the family tree and his s ... Show More
51m 35s
Aug 14
Heisenberg's Uncertainty Principle (Archive Episode)
Melvyn Bragg and guests discuss the German physicist who, at the age of 23 and while still a student, effectively created quantum mechanics for which he later won the Nobel Prize. Werner Heisenberg made this breakthrough in a paper in 1925 when, rather than starting with an idea ... Show More
58m 10s
Aug 7
Napoleon's Hundred Days (Archive Episode)
Melvyn Bragg and guests discuss Napoleon Bonaparte's temporary return to power in France in 1815, following his escape from exile on Elba . He arrived with fewer than a thousand men, yet three weeks later he had displaced Louis XVIII and taken charge of an army as large as any th ... Show More
58m 50s
Recommended Episodes
Jan 2025
Thermodynamics
Thermodynamics is fundamental to mastering chemistry concepts and understanding the energy dynamics within biological systems crucial for the MCAT. In this episode, host Sam Smith dives into the laws of thermodynamics, covering everything from the zeroth law to the third. You'll ... Show More
40m 22s
Nov 2010
Episode 6: Thermodynamics
An introduction to the principles of thermodynamics, including a look at temperature and heat, the laws of thermodynamics, perpetual motion, methods of transferring energy, and the phenomenon of entropy. If you enjoyed the podcast please consider supporting the show by making a p ... Show More
38m 3s
Jan 2025
The Habitability of Planets
Melvyn Bragg and guests discuss some of the great unanswered questions in science: how and where did life on Earth begin, what did it need to thrive and could it be found elsewhere? Charles Darwin speculated that we might look for the cradle of life here in 'some warm little pond ... Show More
52m 50s
Dec 2024
The Antikythera Mechanism
Melvyn Bragg and guests discuss the 2000-year-old device which transformed our understanding of astronomy in ancient Greece. In 1900 a group of sponge divers found the wreck of a ship off the coast of the Greek island of Antikythera. Among the items salvaged was a corroded bronze ... Show More
50m 35s
Mar 2025
What a dark energy discovery means for the fate of the universe
Dark energy, the mysterious force powering the expansion of the universe, appears to be weakening over time, according to a major cosmological survey that has thrown the laws of modern physics into doubt. Ian Sample tells Madeleine Finlay how this new finding could shed light on ... Show More
16m 8s
Apr 2023
Theory of everything: do we really need one?
The quest for a theory of everything – explaining all the forces and particles in the universe – is arguably the holy grail of physics. While each of our main theories of physics works extraordinarily well, they also clash with each other. But do we really need a theory of everyt ... Show More
57m 4s
Dec 2017
21: Einstein's Biggest Idea (General Relativity)
Some see the world of thought divided into two types of ideas: evolutionary and revolutionary ideas. However, the truth can be more nuanced than that; evolutionary ideas can spur revolutions, and revolutionary ideas may be necessary to create incremental advancements. General rel ... Show More
40m 21s
Mar 2024
Heisenberg's Uncertainty Principle
Melvyn Bragg and guests discuss the German physicist who, at the age of 23 and while still a student, effectively created quantum mechanics for which he later won the Nobel Prize. Werner Heisenberg made this breakthrough in a paper in 1925 when, rather than starting with an idea ... Show More
58m 2s
May 2024
Sean Carroll Explains Quantum Field Theory
Sean Carroll is creating a profoundly new approach to sharing physics with a broad audience, one that goes beyond analogies to show how physicists really think. He cuts to the bare mathematical essence of our most profound theories, explaining every step in a uniquely accessible ... Show More
1h 15m