Knudsen zenbakia
Knudsen zenbakia (Kn) batez besteko bide libre molekularra izeneko luzera eta luzera fisiko bereizgarriko eskala baten arteko proportzio bezala definitzen den zenbaki adimentsionala da.
Honela definitzen da:
K
n
=
λ
L
=
k
B
T
2
π
σ
2
P
L
{\displaystyle {\mathit {Kn}={\frac {\lambda }{L}={\frac {k_{B}T}{\sqrt {2}\pi \sigma ^{2}PL}
non
T, tenperatura den(K)
kB , Boltzmannen konstantea den
P, presio osoa den (Pa)
σ
{\displaystyle \sigma }
, diametroa den (m)
Ikus, gainera
Kanpo estekak
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