How to correct collision between particles?

Does the collision of gas particles in an ideal gas affect pressure? In other words, if the particles were to interact as if they did not collide, would the pressure remain the same as an identical situation, except for where the particles collided elastically?

• Answer:

  An ideal gas assumes no particle particle interactions so there are, by definition, no collisions in an ideal glass.  If you use the van der Walls model there are two adjustable constants that account for particle size and attractive forces between particles.   Both of these properties cause deviations from ideality.  So in a real gas particle size does affect pressure and that effect is larger at higher pressures and may be negligible at low or moderate pressures.   In an ideal gas that effect is not present by definition.  Max