Amit Askiitiansexpert
Last Activity: 15 Years ago
Hi,
Degree of Freedom
The number of independent directions in which a system (or gas molecule) can have motion, are called the number of degrees of freedom of that system or molecule. The number of degree of freedom is required to express the position, energy and motion of a system. If a particle in motion is confined to a straight line it has only one transnational degree of freedom, while if the same particle is confined to move in a plane, it will have two translational degrees of freedom. If the particle is free to move in space, it will have three translational degrees of freedom.
A gas molecule can have following types of energies:
(a) Translational kinetic energy
(b) Rotational kinetic energy
(c) Vibrational kinetic energy
Degree of freedom of monatomic, diatomic liner and non-linear polyatomic gas:
|
Nature of motion
|
Degree of Freedom
|
|
Translator
|
Rotational
|
Vibrational
|
Total
|
|
Monatomic
|
3
|
0
|
0
|
3
|
|
Diatomic
|
3
|
2
|
0
|
5
|
|
Linear
|
3
|
2
|
0
|
5
|
|
Non-linear
|
3
|
3
|
0
|
6
|
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Askiitians Expert
Amit - IT BHU
