University:
North Idaho College
Course:
PHYS-211 | Engineering Physics I
Academic year:

2023
Views:

375

Pages:

4
Author:

Hani T.

* law of Corresponding States and Reduced variables. van der Walls Showed that instead of using pressure, volume and Temperatre of a gas, the ratios of these to the corresponding Oritical Constant Could be used. P = P Pc Vc Tc Tr PriVi, Tr are reduced variables (P+) (v-b) = RT for I mele (PEP+) (VKV-b) = RTC Tr Since: Pc = a / 27b^2 Vc = 3b Tc = 8a / 27reb [P(a / 27b^2) + a / 9√r^2b^2] * [3√b - b] = RT, 8a / 27reb a / 27b^2 * (Pr^3 / √r^2) * (3√v - 1) = 8aT / 27b a / 27b * (Pr^3 / √r^2) * (3√v - 1) = 8aT / 27b Pr^3 / √r^2 * (3√v - 1) = 8T This is known as the Reduced equation of State. This expression implies that if two or more guses have the same reduced pressure and reduced Temperature then their reduced volumes Should also be equal. It is found that the values of compressibility factor Z approximately the same for a luge number of gases, you can seel it in Next page in figne→ 1.0 Te-1.5 TR1.2 пет Te P Plots of compressibility factor Z versus reduced pressure for some yje, Varions To Veles at