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The Two Cultures C. P. Snow [Sir Charles Snow].

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Presentation on theme: "The Two Cultures C. P. Snow [Sir Charles Snow]."— Presentation transcript:

1 The Two Cultures C. P. Snow [Sir Charles Snow]

2 Flanders & Swann: Going back to first principles, very briefly: thermodynamics, of course, is derived from two Greek words, thermos, meaning hot - if you don't drop it - and dynamics, meaning dynamic, work; and thermodynamics is simply the science of heat and work, and the relationships between the two as laid down in the Laws of Thermodynamics, which may be expressed in the following simple terms - after me, Donald.

3 The First Law of Thermodymamics:
Heat is work and work is heat Very good! The Second Law of Thermodymamics: Heat cannot of itself pass from one body to a hotter body (scat music starts) Heat won't pass from a cooler to a hotter You can try it if you like but you far better notter 'Cos the cold in the cooler with get hotter as a ruler 'Cos the hotter body's heat will pass to the cooler

4 Heat is work and work is heat and work is heat and heat is work
Heat will pass by conduction Heat will pass by convection Heat will pass by radiation And that's a physical law Heat is work and work's a curse And all the heat in the Universe Is gonna cooool down 'cos it can't increase Then there'll be no more work and there'll be perfect peace Really? Yeah - that's entropy, man! And all because of the Second Law of Thermodynamics, which lays down:

5 That you can't pass heat from the cooler to the hotter
Try it if you like but you far better notter 'Cos the cold in the cooler will get hotter as a ruler 'Cos the hotter body's heat will pass to the cooler Oh, you can't pass heat from the cooler to the hotter You can try it if you like but you'll only look a fooler That's a physical Law! Oh, I'm hot! Hot? That's because you've been working! Oh, Beatles - nothing! That's the First and Second Laws of Thermodynamics!

6 As the pressure on the sample
increases, its volume decreases.

7 ENTROPY: A measure of the disorder of a system. Systems tend to go from a state of order (low entropy) to a state of maximum disorder (high entropy).

8 2.) Disorder 1.) Order 3.) Reordered (requires emergy input)


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