Energy, System

1. Dr. Vishal Patil
Associate Professor
Department of Mechanical Engineering
1
Lecture 01:
Fundamental Concepts and Definitions
Thermodynamics and Energy
Thermodynamic System
 Properties
 Thermodynamic Equilibrium
Sharad Institute of Technology, College of
Engineering, Yadrav- Ichalkarnji
Department of Mechanical Engineering
Thermodynamics

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Content
1. Thermodynamics and Energy
2. Applications of Thermodynamics
3. Thermodynamic System
4. State of System
5. Properties of System
6. Thermodynamic Equilibrium

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1. Thermodynamics and Energy
Thermodynamics can be defined as the
science of Energy. Energy can be defined
as capacity to do work.
Classification of Energy:
1. Stored Energy
a) Potential Energy
b) Kinetic Energy
c) Internal Energy
2. Transit Energy (Transit Energy)

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2. Some Applications of Thermodynamics

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2. Some Applications of Thermodynamics

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3. Thermodynamics System
System
Closed System
or Control Mass
System
Open System
or Control
Volume System
Isolated System
System
Surrounding
System Boundary

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3. Thermodynamics System

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4. State of System

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5. Properties of System
The state of System may be identified or described be certain observable quantities such as
volume, temperature, pressure and density etc. All the quantities, which identify the state of
system are called properties.
Extensive Properties
A quantity of matter in a given system is divided, notionally into a number of parts. The
Properties of system whose value for entire system is equal to the sum of their values for
individual parts of system are called extensive properties. Ex. Total mass, Total volume, Total
Energy
Intensive Properties
It may be notice that, The temperature of the system is not equal to the sum of temperature
of its individual parts. It is also true for pressure and density of system. Ex. Temperature,
Pressure and density.

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6. Thermodynamic Equilibrium
1. Mechanical Equilibrium
A system said to be in mechanical equilibrium when there is no unbalanced force
acting on any part of the system or system as whole. The pressure in the system
is same at all points and does not change with time
2. Thermal Equilibrium
A system said to be in thermal equilibrium when there is no temperature
difference between the parts of the system or between system and surrounding.
3. Chemical Equilibrium
A system said to be in chemical equilibrium when there is no chemical reaction in
the system. The chemical composition is same in the system which does not
change with time

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This video is prepared for academic use only.