Class notes physics kinetic theory of gases

PHYSICS
CH12-KINETIC THEORY OF GASES


ASSUMPTIONS:-
 The molecules of given gas are identical but it is
different from the gases having different
properties.
 The molecule of the gas are perfectly elastic,
rigid,having identical properties etc.
 The molecular-size is negligible.
FREE PATH:-
 Free path refers to the distance between two
successive collision.
 The mean of all free path in a storage is known as
mean free path.

 NOTE:-The number of collision per unit volume in a
gas remains constant


DEGREE OF FREEDOM:-

 It refers to the number of direction a dynamic
system can move freely.it’s the number of
coordinates required to describe the position and
configuration of the system.
 It is represented by the letter (f).


f=3N-R

, N-Number of particles in a molecule.
R-number of relations

TYPES OF DEGREE:-
 Mono-atomic gas
 Di-atomic gas
 Tri-atomic gas

Mono-atomic gas:-
Unbonded single substance , generally gases is known as
mono-atomic gas.
f=3N-R
Eg:-Helium,Neon ,Argon etc.
f=3(1)-0
f=3
Here the value of N will be 1 and R will be 0 (total
no. Of relation is zero as it is mono-atomic.)

Dia-atomic gas:-
f=3N-R
Bonded with one atom together
f=3(2)-(1)
Overall,total 2 atoms will be bonded
f=5
togther.
Eg:-O2,H2,N2 etc.

Number of R will be 1 hear as it is bounded with 1 atom.
Tri-atomic gas:-
tri-atomic has two parts:-
 Linear molecule

 Non-linear molecule