Abstract
Viscosity formulae for gases at critical temperature and atmospheric pressure are introduced in this paper. For the gases φ>3.9 and tc<190°C, the constats K in formula (5) are larger than 5.0. (the only exceptional case is for HCl). This may be called "association effect." H2O vapor (φ>3.9, tc>190°C) also exhibits association effect. For the gases, tc>190°C., the constants K in formula (3) are smaller than 4.65. This may be called "tc effect."
The viscosity formulae α, β and γ were applied, as shown in Table 2.
In many cases, the errors of these formulae, α, β and γ are respectively below 3%, 2% and 5% (Table 3).
μc* were also calculated by Licht-Stechert's formula, Hirschfelder's formula and Uyehara-Watson method. (Table 4).
Licht-Stechert's formula gave big errors for gases which exhibit association effect and for organic gases, tc of which >190°C.
Hirschfelder's formula could not be applied to the gases which exhibit association effect and to the organic gases, tc of which >130°C.
Uyehara-Watson method was in-applicable to organic gases, tc of which >130°C.
