This document provides an overview of thermodynamics. It discusses key topics including:
- Thermodynamics relates heat and work and deals with energy imposed on substances. It is based on experimental observations and four laws.
- Thermodynamic systems, processes, equilibrium, properties, units and dimensions are introduced. Microscopic and macroscopic approaches are compared.
- Important concepts like state, phase, intensive/extensive properties, equations of state, and specific volume/density are defined. Common thermodynamic processes like isothermal, isobaric and isochoric are described.
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MICROSCOPIC & MACROSCOPIC POINT OF VIEW , THERMODYNAMIC SYSTEM & CONTROL VO...KRUNAL RAVAL
Thermodynamics is science of energy transfer and its effects on properties.
Main aim is to convert disorganized form of energy into organized form of energy in an efficient manner. Based on the macroscopic approach which does not require knowledge of behavior of individual particles and is called classical thermodynamics.
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Our Vision & Mission – Simplifying Students Life
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MICROSCOPIC & MACROSCOPIC POINT OF VIEW , THERMODYNAMIC SYSTEM & CONTROL VO...KRUNAL RAVAL
Thermodynamics is science of energy transfer and its effects on properties.
Main aim is to convert disorganized form of energy into organized form of energy in an efficient manner. Based on the macroscopic approach which does not require knowledge of behavior of individual particles and is called classical thermodynamics.
In this PPT have have covered
1. Basic thermodynamics definition
2. Thermodynamics law
3. Properties , cycle, Process
4. Derivation of the Process
5.Formula for the numericals.
This topic is use full for those students who want to study basic thermodynamics as a part of their University syllabus.
Most of the university having basic Mechanical engineering as a subject and in this subject Thermodynamics is a topic so by this PPT our aim is to give presentable knowledge of the subject
notes on thermodynamics system and properties ,which is the on of the basics of thermodynamics useful for mechanical ,chemical engineering,physics students also can read this. for practice objective questions on thermodynamic visit www.testindia24x7.com free online web portal
In this PPT have have covered
1. Basic thermodynamics definition
2. Thermodynamics law
3. Properties , cycle, Process
4. Derivation of the Process
5.Formula for the numericals.
This topic is use full for those students who want to study basic thermodynamics as a part of their University syllabus.
Most of the university having basic Mechanical engineering as a subject and in this subject Thermodynamics is a topic so by this PPT our aim is to give presentable knowledge of the subject
notes on thermodynamics system and properties ,which is the on of the basics of thermodynamics useful for mechanical ,chemical engineering,physics students also can read this. for practice objective questions on thermodynamic visit www.testindia24x7.com free online web portal
Basic Mechanical Engineering Unit 4 Thermodynamics@by V.P.SinghVarun Pratap Singh
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Basic Mechanical Engineering Unit 4 Thermodynamics for B.Tech. First-year students
Unit IV:
Thermodynamics: Thermodynamic system, properties, state, process, Zeroth, First and second law of thermodynamics, thermodynamic processes at constant pressure, volume, enthalpy & entropy.
Steam Engineering: Classification and working of boilers, mountings, and accessories of boilers, steam properties, use of steam tables, P-V, T-S diagram
Unit 1 thermodynamics by varun pratap singh (2020-21 Session)Varun Pratap Singh
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Dear Students,
Please find the Basic Mechanical Engineering (TME-101, 2020-21 Session) Unit One notes in this section.
Topic cover in this section are:
UNIT-1: Fundamental Concepts and Definitions
Definition of thermodynamics, System, Surrounding and universe, Phase, Concept of continuum, Macroscopic & microscopic point of view. Density, Specific volume, Pressure, temperature. Thermodynamic equilibrium, Property, State, Path, Process, Cyclic and non-cyclic processes, Reversible and irreversible processes, Quasi-static process, Energy and its forms, Enthalpy.
i hope, it will helpful to the students and peoples in the search of topics mentioned
it is informative to study to even get passing marks or for revision
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
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Personal development courses are widely available today, with each one promising life-changing outcomes. Tim Han’s Life Mastery Achievers (LMA) Course has drawn a lot of interest. In addition to offering my frank assessment of Success Insider’s LMA Course, this piece examines the course’s effects via a variety of Tim Han LMA course reviews and Success Insider comments.
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The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
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3. Thermodynamics (from the Greek
thermos meaning heat and dynamis
meaning power) is a branch of physics.
It relates heat and work
It deals with the effect of imposition of
energy on the physical properties of
substances.
The foundation of thermodynamics is
based on experimental observations.
4. The observations have been formalized
in to four thermodynamic laws.
Thermodynamics may be broadly
defined as a framework for viewing
and correlating the behaviour of the
system
Historically, thermodynamics
developed out of the need to increase
the efficiency of early steam engines.
5. The first and second laws of
thermodynamics emerged
simultaneously in the 1850s, primarily
out of the works of William Rankine,
Rudolf Clausius, and William Thomson
(Lord Kelvin).
Classical thermodynamics derives from
physicist Robert Boyle’s 1662
postulation.
6. The first thermodynamic textbook was
written in 1859 by William Rankine, a
civil and mechanical engineering
professor at the University of Glasgow
Lord Kelvin coined the term
thermodynamics in his 1849 publication
‘An Account of Carnot's Theory of the
Motive Power of Heat’.
7. Thermodynamic efficiency
In thermodynamics, thermodynamic
efficiency, symbolized by (e), is defined
as:
e=W/Q
where W is the absolute value of work
done in one thermodynamic cycle. Q is the
absolute value of the change in heat.
8. Thermodynamic systems
A thermodynamic system is defined
as that part of the universe that is
under consideration. A real or
imaginary boundary separates the
system from the rest of the universe,
which is referred to as the environment
or surrounding.
9.
10. Isolated Systems – matter and energy do
not cross the boundary.
Adiabatic Systems – heat does not cross
the boundary.
Diathermic Systems - heat crosses
boundary.
Closed Systems – matter does not cross
the boundary.
Open Systems – heat, work, and matter
may cross the boundary.
11. A control volume is a volume in
space of interest for a particular
study or analysis. The surface of
this control volume is called the
control surface.
Control volume
The size and shape of control
volume are arbitrarily chosen to
suit our analysis.
12. Mass as well as heat and work can
cross the control surface, and the
mass in the control volume (as well as
its properties) change with time.
The boundary may be fixed, or it
may move (expand or contract).
13. Control volume is an open system
massin massout
control
volume
Consider a tank with a
piston and one inlet,
and one outlet.
Through the inlet
mass comes in and
through the outlet it
goes out.
14. Control Mass
No exchange of mass is allowed, it
resembles a closed system
As a control mass undergoes a change of
state, energy may cross the boundary as
either heat or work.
15. Microscopic Approach
Microscopic point of view is based on
molecular level study to explain the
behaviour of a system.
A huge number of variables are required to
specify the condition of a system
Statistical thermodynamics is based on
microscopic approach
16. Macroscopic approach
Macroscopic point of view is based on
gross or time-averaged effects of many
molecules.
In this approach the condition of system can
be specified by only measurable quantity
like P, V, T and the number of variables to
be dealt with are quite few.
These effects can be perceived by human
senses and measured by instruments.
17. Statistical thermodynamics is a branch
of thermodynamics concerned with the
study and analysis of actual phenomena
with full interpretation, explanation, and
evaluation of microscopic, i.e. statistical
energy-level atomic and molecular
details.
18. It is a branch of thermodynamics
concerned with the study and analysis of
actual phenomena with avoidance of full
interpretation, explanation, and evaluation
of microscopic, i.e. statistical energy-level
atomic and molecular details. Generally,
phenomenological thermodynamics, being
synonymous with classical
thermodynamics.
Phenomenological thermodynamics
19. Thermodynamic properties
These are the attributes that can
characterize the system by P, V, T,
density, specific heat etc.
Extensive property: It depend on the
system size or the amount of material in
the system. Mass, volume, entropy, energy
(Internal energy and enthalpy) are
examples of it.
20. Intensive Property: is the physical
property of the system that does not
depend on the system size or the amount
of material in the system. The examples
are temperature, pressure, and density.
21. The properties of the system can be
described by an equation of state which
specifies the relationship between these
extensive and intensive parameters or
variables.
Thermodynamic properties are defined for,
and significant to, only thermodynamic
equilibrium states.
22. Thermodynamic state
The state of the thermodynamic system can
be thought of as an optimal ensemble of
thermodynamic parameters, namely
temperature, pressure, density, composition,
etc., which characterize the system. Neither
its surroundings nor its history characterize
the system.
26. For a system, each of the properties at a
particular state has unique set of intensive
properties regardless of the path, how the
system has arrived to that particular state.
State properties are path independent.
Phase: A quantity of matter homogeneous
throughout in chemical composition and
physical structure is called a phase. Vapour,
liquid and solid are the three phases.
27. Thermodynamic Equilibrium
A system is said to be in equilibrium,
where there is no change in
macroscopic property is registered,
when the system is kept isolated from
the surroundings.
A system in equilibrium never changes
to any other state spontaneously.
28. At equilibrium the state properties do not
change until and unless there is an
energetic evolution from one to another
state.
The word equilibrium implies a state of
balance. In an equilibrium state, there
are no unbalanced potentials (or driving
forces) within the system.
29. The system is in equilibrium in three
ways:
Thermal equilibrium
Mechanical equilibrium
Chemical equilibrium
Thermodynamics studies mainly the
properties of physical systems that are
found in equilibrium state.
30. Mechanical equilibrium: In the absence
of any unbalanced force within the
system itself and between the system and
surrounding, the system is said to be in
mechanical equilibrium.
Chemical equilibrium:If there is no
chemical reaction or transfer of matter
from one part of the system to another the
system is said to be in chemical
equilibrium
31. Thermal equilibrium: When the system
is separated from its surroundings by a
diathermic ( means allows the heat to
flow) wall and if there is no change in
temperature of the system, the system is
said to be in thermal equilibrium with the
surroundings.
32. Both classical and statistical
thermodynamics study mainly the
equilibrium states of a system.
Non-equilibrium thermodynamics is a
branch of thermodynamics concerned
with studying irreversible
transformations.
33. Process
The path of the succession of states through
which the system passes is called the
process.
A thermodynamic process may be defined
as the energetic evolution of a
thermodynamic system proceeding from an
initial state to a final state.
35. Quasi equilibrium process: Such a
process is the locus of all the equilibrium
points through which the system passes.
Infinite slowness is the attribute of the
process.
In quasi--static process the departure of
the state of the system from the
thermodynamic equilibrium state is
infinitely small
36. An isothermal process occurs at a constant
temperature. An example would be to have
a system immersed in a large constant-
temperature bath. Any work performed by
the system will loose equivalent amount of
energy to the bath, but its temperature will
remain constant.
38. An isobaric process occurs at constant
pressure. An example would be to have a
movable piston in a cylinder, so that the
pressure inside the cylinder is always at
atmospheric pressure, although it is
isolated from the atmosphere.
40. An isochoric process is one in which the volume
is held constant, meaning that the work done by
the system will be zero. An isochoric process is
also known as an isometric process.
An example would be to place a closed tin can
containing only air into a fire. To a first
approximation, the can will not expand, and the
only change will be that the gas gains internal
energy, as evidenced by its increase in
temperature and pressure.
42. A thermodynamic
cycle is a series of
thermodynamic
processes which
returns a system to its
initial state.
A
B
Cyclic Process
P
V
43. Thermodynamic cycles often use quasi-
static process to model the workings of
actual devices to obtain maximum
efficiency.
44. Two primary classes of thermodynamic
cycles are
Power cycle
Refrigeration cycle
Power cycles are cycles which convert
a heat input into a work output.
e.g.,Internal combustion engine.
Refrigeration cycles transfer heat from
low to high temperatures using work
input. e.g., refrigerator.
45. A dimension is a physical variable used to
specify the behavior or nature of the
particular system. The length of a rod is a
dimension of the rod.The gas temperature is
a thermodynamic dimension of a gas.
Units and Dimensions
Units are needed to measure the dimension.
47. Basic units (S. I)
Mass (M), kg
Length (L), m
Time (t), s
Amount of substance, mole
Temperature, K
Electrical current, A
Luminous Intensity, candela, cd
Plane angle, rad
49. English Engineering unit system
(Basic units)
Length, ft
Mass, lbm
Time, s
Amount of substance, lb mole
Temperature, R
Force (F), lbf
50. The value of gc in SI and Engineering unit
The unit of force is derived from Newton.s
second law
F m X a or F X C = m X a
where ‘m’ is the mass and ‘a’ is the
acceleration.
In SI unit, m = 1 kg and a = 9.80665 m/s2
Then F = 9.80665 N
9.80665 N X C = 1 kg X 9.80665 m/s2
C=1 kg m/s2/N
51. If we replace C by gc, the gravitational
constant
F= m a/ gc
In SI unit, gc, = 1 kg m/s2/N = 1
In Engineering unit, F= 1 lbf , m= 1 lbm
a=32.174 ft/ s2
Hence, 1 lbf X C = 1 lbm X 32.174 ft/ s2
C = 32.174 lbm ft/ s2/ lbf
gc, = 32.174 lbm ft/ s2
52. Energy
Macroscopic mode of energy
Microscopic mode of energy
The two types of macroscopic mode of
energies are,
Kinetic Energy
Potential energy
53. Molecular Kinetic energy: It is
associated with the translational
velocity of individual molecules.
Microscopic mode of energy are of three
types,
Intermolecular potential energy: It is
associated with the forces between the
molecules and their position with
respect to each other.
54. Intramolecular energy: It is associated
with molecular and atomic structure and
related force
Total Energy= Macroscopic energy +
microscopic energy
=Kinetic energy + Potential
energy + Internal Energy
55. Continuum
From macroscopic point of view we
deal with volumes which are very large
compared to its molecular dimension.
Within this volume span we can
assume the substance to be continuous
and can be divided infinite times
disregarding the action of individual
molecule.
56. Continuum
The continuum concept looses its
validity when molecular mean free path
of the molecules approaches the
dimension of the vessel. e.g., In vacuum
technology, in microchannel flow.
57. Specific Volume and Density
The Specific Volume of a system in a
gravitational field may vary from point
to point.
Specific Volume: volume per unit mass
Specific Density: mass per unit volume
Both are intensive properties
v
58. where is the smallest volume for
which the mass can be considered a
continuum.
V
m
V
v
VV
lim
59. The specific volume and density are
defined at a point in system. It may vary
with elevation.
But change in specific volume with
elevation is not significant. So we can
take one value of and
Contd
v
60. The specific volume and density
may be given either on mass or on
mole basis.
Molal specific volume =
Molal density =
61. Pressure
With liquids and gases: pressure, with
solids: stresses
It is defined as the normal component of
force per unit area.
A
F
P n
AA
lim
where is the smallest area for
which the fluid can be considered a
continuum.
A
62. Units of Pressure
Unit for Pressure in International
System: force of one newton acting on
a square meter area.
Other units
2
/11 mNPa
5
2
1bar = 10 Pa = 0.1MPa
1atm = 101325Pa = 14.696lbf/in
64. Measurement of pressure difference
Fluid
P
A B
Patm. = Po
H
Force acting at B
0 0P A mg P A AgH
Force acting at A
PA
Pressure Difference: ghPPP 0
65. Temperature
Because of difficulties in defining
temperature, we define equality of
temperature.
The two bodies have equality of
temperature, if there is no change in any
observable property occurs when they
are in thermal communication.
66. The Zeroth Law of Thermodynamics
When two bodies have equality of
temperature with a third body, they
must have equality of temperature with
each other.