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molar refractivity ：ウィキペディア英語版

molar refractivity
Molar refractivity,

A

, is a measure of the total polarizability of a mole of a substance and is dependent on the temperature, the index of refraction, and the pressure.
The molar refractivity is defined as
:

A = \frac N_A \alpha,

where

N_A \approx 6.022 \times 10^

\alpha

is the mean polarizability of a molecule.
Substituting the molar refractivity into the Lorentz-Lorenz formula gives
:

A = \frac \frac

For a gas,

n^2 \approx 1

, so the molar refractivity can be approximated by
:

A = \frac \frac.

In SI units,

R

has units of J mol⁻¹ K⁻¹,

T

has units K,

n

has no units, and

p

has units of Pa, so the units of

A

are m³ mol⁻¹.
In terms of density, ρ molecular weight, M it can be shown that:
:

A = \frac \frac \approx \frac \frac.

==References==

* Born, Max, and Wolf, Emil, ''Principles of Optics: Electromagnetic Theory of Propagation, Interference and Diffraction of Light'' (7th ed.), section 2.3.3, Cambridge University Press (1999) ISBN 0-521-64222-1

抄文引用元・出典: フリー百科事典『ウィキペディア（Wikipedia）』
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