virial coefficients

virial coefficients

[′vir·ē·əl ‚kō·i′fish·əns]
(thermodynamics)
For a given temperature T, one of the coefficients in the expansion of P/RT in inverse powers of the molar volume, where P is the pressure and R is the gas constant.
References in periodicals archive ?
A straightforward expression of [[phi].sup.vap.sub.w] from the virial expansion (truncated at the level of third virial coefficients) was recently presented by Feistel et al.
Molecular origins of osmotic second virial coefficients of proteins.
Second virial coefficients and dn/dc values at various pHs and concentrations.
However, Kojima [9] observed that it is quite effective for calculating virial coefficients from the Stockmayer intermolecular potential model with an aid of introducing a reduced temperature-correction parameter of [tau] as (T - [tau]) instead of using temperature T.
* the calculation of the second and third molar virial coefficients [B.sub.aa] and [C.sub.aaa] for dry air from the fundamental Lemmon et al.
In this equation, the mixture virial coefficients are related to the saturation air and water vapor molar fractions and to the components' virial coefficients through the following:
[DELTA]B difference between second virial coefficients for two-body collisions, as defined below Equation (A-4)
The closing chapters list enthalpy changes in polymer solutions at elevated pressures, PVT data of some selected polymers and their solutions, and second virial coefficients.
These include molecular weight, diffusion coefficients, virial coefficients, and particle size.
The CGS-3 can perform simultaneous analysis of both static and dynamic light-scattering parameters, resulting in better and faster measurement of particle size, molecular weight, diffusion coefficients and virial coefficients. The CGS-3 is research-grade, but has been designed so that it does not require an optical table, making it suitable for a igeneral laboratory.
A short paper presented at the 1989 Prague meeting describes qualitatively the origin of the difference in the second virial coefficients of H2O and D2O steam, which is determined mainly by the change of the O-H or O-D stretching frequencies when the dimers are formed.