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CH-107

Lecture

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CHEMICAL
ENGINEERING
THERMODYNAMICS-I
Dr
...
M Smith, 7th Edition
...

• “Thermodynamics, an Engineering
Approch” by Yunus A Cengel
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CHEMICAL ENGINEERING THERMODYNAMICS-I

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Faculty of Chemical Engineering, NEDUET

Lecture Outline
Concept of Ideal Gas
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Difference B/W Adiabatic & Isothermal
Process
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Volume of gas molecule is negligible as
compared to overall volume of a gas
...

The simplest and best-known equation of
state for substances in the gas phase is
the ideal-gas equation of state
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The farther away Z is from unity, the more the
gas deviates from ideal-gas behavior
...
e
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Question: What is the criteria for low pressure
and high temperature?
Answer: The pressure or temperature of a gas
is high or low relative to its critical temperature
or pressure
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This equation is given by a power series expansion
for the compressibility factor in concentration (or the reciprocal
of molar volume)

Here B, C,
...
virial
coefficients; these parameters depend only on
temperature (and composition for mixtures)
...

From this point of view, can you see why you need to include
more and more terms as the pressure increases?

Additionally, if the pressure is so low that not even
two-body interactions affect the system properties, we
have an ideal gas

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