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Boundless Physics
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Chapter 14

Thermodynamics

Book Version 3
By Boundless
Boundless Physics
Physics
by Boundless
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Section 1
Introduction
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Work

Work performed by a closed system is the energy transferred to another system that is measured by mechanical constraints on the system.

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A Review of the Zeroth Law

Zeroth law justifies the use of thermodynamic temperature, defined as the shared temperature of three designated systems at equilibrium.

Section 2
The First Law of Thermodynamics
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The First Law

The 1st law of thermodynamics states that internal energy change of a system equals net heat transfer minus net work done by the system.

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Constant Pressure and Volume

Isobaric process is one in which a gas does work at constant pressure, while an isochoric process is one in which volume is kept constant.

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Isothermal Processes

An isothermal process is a change of a thermodynamic system, in which the temperature remains constant.

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Adiabatic Processes

An adiabatic process is any process occurring without gain or loss of heat within a system.

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Human Metabolism

The 1st law of thermodynamics explains human metabolism: the conversion of food into energy that is used by the body to perform activities.

Section 3
The Second Law of Thermodynamics
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The Second Law

The second law of thermodynamics states that heat transfer occurs spontaneously only from higher to lower temperature bodies.

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Heat Engines

In thermodynamics, a heat engine is a system that performs the conversion of heat or thermal energy to mechanical work.

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Carnot Cycles

The Carnot cycle is the most efficient cyclical process possible and uses only reversible processes through its cycle.

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Heat Pumps and Refrigerators

A heat pump is a device that transfers heat energy from a heat source to a heat sink against a temperature gradient.

Section 4
Entropy
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What is Entropy?

The entropy of a system is a measure of its disorder and of the unavailability of energy to do work.

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Stastical Interpretation of Entropy

According the second law of thermodynamics, disorder is vastly more likely than order.

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Order to Disorder

Entropy is a measure of disorder, so increased entropy means more disorder in the system.

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Heat Death

The entropy of the universe is constantly increasing and is destined for thermodynamic equilibrium, called the heat death of the universe.

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Living Systems and Evolution

It is possible for the entropy of one part of the universe to decrease, provided the total change in entropy of the universe increases.

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Global Warming Revisited

The Second Law of Thermodynamics may help provide explanation for the global warming over the last 250 years.

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Thermal Pollution

Thermal pollution is the degradation of water quality by any process that changes ambient water temperature.

Section 5
The Third Law of Thermodynamics
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The Third Law

According to the third law of thermodynamics, the entropy of a perfect crystal at absolute zero is exactly equal to zero.

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Adiabatic Processes

It is impossible to reduce the temperature of any system to zero temperature in a finite number of finite operations.

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Heat and Heat Transfer
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Chapter 14
Thermodynamics
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  • Entropy
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Waves and Vibrations
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