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19. Equation of State and Basic Thermodynamic Processes

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yaboiemil's version from 2016-02-04 19:35

Section

1. An ideal gas is a gas that obeys all gas laws exactly
2. An ideal gas can be compressed without limit because it is presumed that the molecules take up negligible space

The Ideal Gas Equation

 

 

Question Answer
pPressure (Pa)
VVolume (m^3)
nAmount of Sub. (mol)
RUniversal Gas Constant (8.314J.K^-1)
TAbsolute Temperature (K)
memorize

 

This equation is only exact for the equilibrium state of an ideal gas.
To describe a real gas, there is the...

van der Waals equation:

 

 

Question Answer
pPressure (Pa)
VVolume (m^3)
nAmount of Sub. (mol)
RUniversal Gas Constant (8.314J.K^-1)
TAbsolute Temperature (K)
aempirical constant related to v.d.W forces between gas molecules
bempirical constant, volume of 1mol of gas in liquid state
memorize

There are 4 Thermodynamic Processes

 

NameCharacteristicConnected Law
IsothermalTemperature is constant.Expressed by Boyle's Law p.V = Constant
IsobaricPressure is constant.Expressed by Gay-Lussac's Law V/T = Constant
IsochoricVolume is Constant.Expressed by Gay-Lussac's law p/T = Constant
AdiabaticEntropy is constant.System can't transfer heat with surroundings. p.V^k
memorize

 

Question Answer
KPoisson's Constant, defined by ratio Cp/Cv from Mayers Equation
Mayers EquationCp = Cv + R
memorize

 

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