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Description

 

First Law of Thermodynamics:           DQ = DU + DW = DU + P DV

(Energy Conservation)


 

ISOCHORIC PROCESS (DV = 0)

Definition of specific heat capacity at constant volume.

* This relation is true even when the process is not at constant volume for Ideal Gases. For ideal like gases, T is a measurement of the internal energy.

 

ADIABATIC PROCESS (DQ = 0)

 

DU +DW = 0

A system making adiabatic work losses internal energy (DU = -DW).

The constant is eliminated by setting:

 


 

ISOBARIC PROCESS (P constant)

 

the Molar specific heat capacity.

 

ISOTHERMAL PROCESS (T constant)

 

Since DT = 0, there is not change in the Internal Energy of the system DU = 0.

 

For an Ideal Gas,

 


 

First Law of Thermodynamics:           DQ = DU + DW = DU + P DV

(Energy Conservation)


 

ISOCHORIC PROCESS (DV = 0)

 

Definition of specific heat capacity at constant volume.

* This relation is true even when the process is not at constant volume for Ideal Gases. For ideal like gases, T is a measurement of the internal energy.

 


 

ADIABATIC PROCESS (DQ = 0)

 

DU +DW = 0

A system making adiabatic work losses internal energy (DU = -DW).

The relation can be reduced to

 


 

ISOBARIC PROCESS (P constant)

 

the Molar specific heat capacity.

 

ISOTHERMAL PROCESS (T constant)

 

Since DT = 0, there is not change in the Internal Energy of the system DU = 0.

 

For an Ideal Gas,

 

Text Box: g- Different Gases
Monatomic: He, Ar = 1.67
Ne = 1.64, Kr = 1.69
Diatomic: H2 = 1.41
N2, O2, CO = 1.40
Polyatomic: 1.30

 

 

 

 

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by Luis F. Sez, Ph. D.    Comments and Suggestions: LSaez@dallaswinwin.com