Thermodynamics - Linn–Benton Community...
Transcript of Thermodynamics - Linn–Benton Community...
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Thermodynamics
Temperature: average kinetic energy per
molecule
Heat: Energy transfered by virtue of a temperature
difference flow from Hot to Cold
Thermal Energy: The portion of the internal energy
that increases when heat is added
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Heat• 1 liter of water in left pot. 3 liters in right pot.
• both pots absorb the same quantity of heat
• temperature increases three times as much in
the pot with the smaller amount of water.
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The quantity of heat needed to raise the temperature of a
certain substance a specific amount is 1 Calorie. This is the
same amount of energy as
A. 1000 calories.
Quantity of HeatCHECK YOUR NEIGHBOR
A. 1000 calories.
B. 4.18 joules.
C. Both of these.
D. Neither of these.
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The quantity of heat needed to raise the temperature of a
certain substance a specific amount is 1 Calorie. This is the
same amount of energy as
A. 1000 calories.
Quantity of HeatCHECK YOUR ANSWER
A. 1000 calories.
B. 4.18 joules.
C. Both of these.D. Neither of these.
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You heat a half-cup of tea and its temperature rises by 8°C.
How much will the temperature rise if you add the same amount of heat to a full cup of tea?
A. 0°C.
Quantity of HeatCHECK YOUR NEIGHBOR
A. 0°C.
B. 2°C.
C. 4°C.
D. 8°C.
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You heat a half-cup of tea and its temperature rises by 8°C.
How much will the temperature rise if you add the same amount of heat to a full cup of tea?
A. 0°C.
Quantity of HeatCHECK YOUR ANSWER
A. 0°C.
B. 2°C.
C. 4°°°°C.D. 8°C.
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Thermodynamics
Thermodynamics started out as a macroscopic theory.
Max Plank pushed the idea that you could describe things
both macroscopically and microscopically.
What is heat? What is heat?
It was originally thought that there is a thing called caloric
fluid that flows from hot to cold.
This was disproved experimentally. Ex: cannon making
Heat = energy, supported by observations. Ex: pendulum
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The Laws of Thermodynamics
First law of thermodynamics
• When heat flows to or from a system, the system gains or loses an amount of heat equal to the gains or loses an amount of heat equal to the amount of heat transferred.
more specifically,
heat added = increase internal energy + external
work done by the system
• Energy can neither be created nor destroyed.
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Why does air cool as it rises?
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The Laws of Thermodynamics
Second law of thermodynamics
• Restates direction of heat flow:
Heat never spontaneously flows from a cold substance to a hot substanceExamples:Examples:
– in summer, heat flows from the hot air outside into the cooler interior of a dwelling
– in winter, heat flows from the warm inside to the cold exterior
• Heat can flow from cold to hot only when work is done on the system or by adding energy from another source (as in heat pumps and air conditioners, where the direction of heat flow isn’t spontaneous)
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Ludwig Boltzmann, who spent much of his life studying
statistical mechanics, died in 1906, by his own hand. Paul
Ehrenfest, carrying on the work, died similarly in 1933. Now it Ehrenfest, carrying on the work, died similarly in 1933. Now it
is our turn to study statistical mechanics. Perhaps it will be
wise to approach the subject cautiously.
-- David L. Goodstein
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Suppose you drop and ice cube into a cup
of hot tea. The ice melts and the water will of hot tea. The ice melts and the water will
cool. Why doesn’t the reverse happen --
the water warming back up and an ice
cube forming?
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Microscopic View
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Will it spontaneously reinflate?
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Will it spontaneously reinflate?
It is possible, but extremely improbable. It is only one of a very large number of things that could
happen. A high entropy system has a high number of possible states.
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There are several ways to express the 2nd Law:
Macroscopic:
Heat flows from hot to cold.Heat flows from hot to cold.
You can’t have a perfect heat engine or a perfect
refrigerator.
Microscopic:
In a closed system, entropy increases as time goes
by. Entropy is a measure of disorder.
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ŅMaxwellÕs demonÓ
Thought experiment: A little "demon" guards a trapdoor between the
two containers. When a faster-than-average molecule from A fliestowards the trapdoor, the demon opens it, and the molecule will
fly from A to B. The average speed of the molecules in B will haveincreased while in A they will have slowed down on average.increased while in A they will have slowed down on average.
Violation of 2nd Law?
AB
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When work is done on a system, compressing air in a tire pump for example, the temperature of the system
A. increases.
B. decreases.
The Laws of ThermodynamicsCHECK YOUR NEIGHBOR
B. decreases.
C. remains unchanged.
D. is no longer evident.
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When work is done on a system, compressing air in a tire
pump for example, the temperature of the system
A. increases.B. decreases.
The Laws of ThermodynamicsCHECK YOUR ANSWER
B. decreases.
C. remains unchanged.
D. is no longer evident.
Explanation:
In accord with the first law of thermodynamics, work input increases the energy of the system.
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When a hot cup is filled with cold water, the direction of
heat flow is
A. from the cup to the water.
B. from the water to the cup.
The Laws of ThermodynamicsCHECK YOUR NEIGHBOR
B. from the water to the cup.
C. random, in no particular direction.
D. nonexistent.
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When a hot cup is filled with cold water, the direction of
heat flow is
A. from the cup to the water.B. from the water to the cup.
The Laws of ThermodynamicsCHECK YOUR ANSWER
B. from the water to the cup.
C. random, in no particular direction.
D. nonexistent.
Explanation:
The second law of thermodynamics tells us that the direction of unassisted heat flow is from hot to cold. (If assisted with energy input, as with an air conditioner for example, then heat can flow from cold to hot.)
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Entropy
Entropy
is a measure of the disorder of a system.
Whenever energy freely transforms from one form to another, the direction of transformation is toward a another, the direction of transformation is toward a state of greater disorder and, therefore, toward one of greater entropy.
The greater the disorder ⇒ the higher the
entropy.
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Entropy
Second law of thermodynamics — restatement:
Natural systems tend to disperse from concentrated and organized-energy states toward diffuse and disorganized states.diffuse and disorganized states.
Energy tends to degrade and disperse with time.
The total amount of entropy in any system tends to
increase with time.
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Your garage gets messier each week. In this case, the entropy of your garage is
A. increasing.
B. decreasing.
EntropyCHECK YOUR NEIGHBOR
B. decreasing.
C. hanging steady.
D. nonexistent.
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Your garage gets messier each week. In this case, the entropy of your garage is
A. increasing.B. decreasing.
EntropyCHECK YOUR ANSWER
B. decreasing.
C. hanging steady.
D. nonexistent.
Comment:
If your garage became more organized each week, then entropy would
decrease in proportion to the effort expended.
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The Laws of Thermodynamics
Third Law of Thermodynamics:
No system can reach absolute zero.
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Three Laws of Thermodynamics (paraphrased):
First Law: You can't get anything without working for it.working for it.
Second Law: The most you can accomplish by
work is to break even.
Third Law: You can't break even.
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Three Laws of Thermodynamics (paraphrased):
First Law: You can't get anything without working for it.working for it.
Second Law: The most you can accomplish by
work is to break even.
Third Law: You can't break even.
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Three Laws of Thermodynamics (paraphrased):
First Law: You can't get anything without working for it.working for it.
Second Law: The most you can accomplish by
work is to break even.
Third Law: You can't break even.
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Three Laws of Thermodynamics (paraphrased):
First Law: You can't get anything without working for it.working for it.
Second Law: The most you can accomplish by
work is to break even.
Third Law: You can't break even.
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Specific Heat Capacity
Specific heat capacity
is defined as the quantity of heat required to
change the temperature of 1 unit mass of a change the temperature of 1 unit mass of a
substance by 1 degree.
• thermal inertia that indicates the resistance
of a substance to a change in temperature.
• sometimes simply called specific heat.
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Thermodynamics
Temperature: average kinetic energy per
molecule
Heat: Energy transfered by virtue of a temperature
difference flow from Hot to Cold
Thermal Energy: The portion of the internal energy
that increases when heat is added
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Specific Heat Capacity
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Specific Heat Capacity
Amount of HeatAmount of Heat
that goes into (or out
of) a substance
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Specific Heat Capacity
Amount of Heat
mass of
substanceAmount of Heat
that goes into (or out
of) a substance
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Specific Heat Capacity
Amount of Heat
mass of
substanceChange in
TemperatureAmount of Heat
that goes into (or out
of) a substance
Temperature
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Specific Heat Capacity
Amount of Heat
mass of
substanceChange in
TemperatureAmount of Heat
that goes into (or out
of) a substance
Specific Heat Capacity
Temperature
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Specific Heat Capacity
Amount of Heat
mass of
substanceChange in
TemperatureAmount of Heat
that goes into (or out
of) a substance
Specific Heat Capacity
Temperature