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

2023
Views:

457

Pages:

4
Author:

Hani T.

Equation of State for Real gases. various attempts have been made to derive equations of State for real yases one is the of the most useful van de walls equation. Correction for molecular volumes. 18 n in moles of a gas are placed a contiriner of volume v, the / actual volume available would be less than V. Since the finite volume of the gas molecules must be Substracted fom V. Correction for pressure. Consider a molecule in the interior of a gas. It is surrounded by other molecules uniformly on all sides. As this molecule approaches the surface, this uniform distribution of other molecules is distributed and it is now attracted from one side only, it will experience a net inward pull, striking the wall with a lower velocity. It would exert a lower pressure than it would have done if there were No forces of attraction. The measured pressure would be less than the ideal pressure P(real, ideal) = Pactual + pa The net inward pull experienced by molecules would be proportional to: The number of molecules in the bulk of the gas. The number of molecules striking the wall per unit area. Both these factors are proportional to the number of molecules per unit volume (n/V) where V is the volume occupied by n moles of the gas.