Laws of Thermodynamics
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1 Laws of Thermodynamics FIRST LAW- energy is neither created nor destroyed Total energy remains constant Form of energy can be changed Potential to kinetic Aka law of conservation of energy
2 1st law & Ecosystems Sun=Energy>biomass via photosynthesis>food chains>consumed>leaves ecosystem as heat
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6 Second Law Entropy increases over time Energy transformations are not 100% efficient, so the E to do work Entropy- Randomness
7 The Nature of Equilibria Equilibrium-ne; Equilibria- 1+ Steady stated= equilibrium Open, living systems No long term changes, but short term Overall balance of system remains stable Almost all open systems in nature
8 Combustion & Cell Respiration: two examples that illustrate the 1st and the 2nd laws of Thermodynamics Chemical Energy (petrol) Chemical Energy (sugar) 100 J 100 J PROCESS Combustion 20 J ATP PROCESS Cell Respiration 40 J Heat Energy 80 J Heat Energy 60 J 8
9 The Second Law of Thermodynamics in numbers: The 10% Law For most ecological process, theamount of energy that is passed from one trophic level to the next is on average 10%. Heat Heat Heat 900 J 90 J 9 J Energy 1 Process 1 Process 2 Process J 100 J 10 J 1 J J = Joule SI Unit of Energy 1kJ = 1 Kilo Joule = 1000 Joules 9
10 Primary Producers and the 2 nd law of Thermodynamics (Output) (Output) (Output) 10
11 The Ecosystem and the 2 nd law of Thermodynamics Heat What determines that some ecosystems are more efficient than others? Heat Heat Heat Heat 11
12 IB Question 12
13 13
14 IB Question 14
15 IB Question 15
16 IB Question 16
17 Equilibrium Steady state Open, living systems No long term changes, but many short term Overall balance of system stays stable almost all open systems in nature Achieve through negative feedback systems
18 After disturbance- goes to equilibrium
19 Static Equilibrium Closed, non living systems No change over time Example books sitting on desk will remain unchanged until toppled over. Pile of rocks or building Can be stable or unstable as in rocks on a cliff
20 Principles of feedback Natural systems regulate themselves Change to new status or return to original state after a disturbance.
21 Positive Feedback Change in system that moves further from norm Reinforces & accelerates change Early changes lead to greater changes over time snowball effect Examples- birth, blood clot Pg. 80- body shutting down from cold Poverty causing illness Global warming- higher temps may cause more evaporation> more water in atmosphere> water vapor is a greenhouse
22 Negative Changes offsets or neutralizes changes and returns to equilibrium A form of control; self regulating effect on system Ex predator - prey relationship Body temp increasing and sweating Thermostat Organisms have internal feedback systems for breeding
23 Transfer & Transformation processes Matter and energy flow through system Trends move through Imput>storage> outut Matter tends to cycle- water, carbon, nitrogen
24 Transfers do NOT change the form of energy or matter Keeps same state Water being carried by stream Movement of material- carnivores eating other animals
25 Transformations Change form of energy and, or state Require more (E) bc of more complex Ex. Farmer bringing animal manure to his fields is transfer process. The transformation happens when the manure decomposes, its nutrients bc part of the soil matrix and r incorporated into the phys. Structure of the food crops
26 Flows Movement through or w/in a system (E) tends to flow- input>storage>output Matter cycles continuously w/in system
27 Storages Matter/(E) remain in system Solar radiation converted to glucose during photosynthesis is stored as chemical (E) in the bonds w/in plant cells
28 Physical- wind tunnel, globe etc Models Software- climate change, Lovelock s daisy world Mathematical formula Data flow diagrams
29 Advantages Simpler than reality to study Can change w/o disastrous effects Useful for predictions
30 Disadvantages May be incomplete, so not accurate Liable to human error
31
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