Deviation from Ideal Gas Behavior
The concept of ideal gas is hypothetical as no gas is practically ideal.
By Sakshi Goel | 28 Oct'18 | 2 K Views |
Theory
The non-ideal gases or real gases obey ideal gas equation only under two conditions:
1) Low pressure
2) High temperature
Explanation for the deviation from ideal gas behavior:
1) According to ideal gas behavior, the forces of attraction between gas molecules are zero. But at very high pressure, the molecules come very close to each other, so the repulsive forces operate. And after a certain distance, attractive forces operate. So, the intermolecular forces cannot be neglected.
2) According to ideal gas behavior, the volume occupied by the molecules is negligible small as compared to the total volume occupied by gas. But at high pressure and low temperatuure, the volume occupied by molecules remain the same and the volume occupied by gas decreases. So, the volume occupied by molecules cannot be neglected.
