Mean Free Path and Heat Capacity of Gases Flashcards
1
Q
sqrt() =
A
vrms
2
Q
vrms =
A
sqrt(3kbT/m) = sqrt(3RT/M)
3
Q
At the same temperature different gas molecules move with
A
different vrms
4
Q
collisions between molecules
mean free path - λ
A
λ = vtmean
λ = kbT/4sqrt(2)πr^2p
5
Q
Heat Capacity
A
adding some heat dQ increases temperature by dT
6
Q
Ktr
A
monatomic
7
Q
for diatomic and polyatomic molecules
A
there are other forms of kinetic energy
8
Q
principle of equipartition of energy
A
Each component of energy has an average an associated energy per molecule of 1/2kbT
9
Q
Degrees of freedom
A
Number of energy components required to describe motion of a molecule
10
Q
Heat capacities at constant volume
A
Cv = (3/2)R Monatomic Cv = (5/2)R Diatomic Cv = (7/2)R
depending on degrees of freedom,
