I need to go somewhere where there is less people...
Jim moves to an area with a fewer number of people.
The gate agent helps people who are boarding the plane.
Hello, how can I assist you?
Only the people who have the correct ticket are allowed through.
Sorry sir, but you are at the wrong entrance. Your gate is a couple yards further.
Finally, it is time to board the plane! Jim nods of after a long day.
Z Z Z
Jim goes from a highly populated (concentrated) area to an area with a lower population or concentration of people (similar to passive transport).At the gate agent's desk, only certain people are allowed to pass through (similar to a selectively permeable membrane)