Originally posted by agoekjian
I'm wondering why it is that generally, but especially during Carnivals or other big celebrations in cities, people don't tend to gather in the same place at the same time. Or perhaps they do but on the whole distribution seems to be relatively even. A friend told me that it was probably connected to the phenomenon which stops air molecules from gathering in one spot, thus preventing us from choking to death. Am I missing the obvious?
If you look at the planet from space, humans are not randomly distributed. More are in cities than elsewhere, for example.
If you look at a big celebration, people are also not randomly distributed. People will be more likely to be at a bar, near the stage, near the rides, near the food, etc.
There are similar processes going on with the people and the air molecules. However the laws of physics which describe why air particles are evenly distributed assume a homogenous environment. If there were some sort of factor like a hole to a vacuum on one side of a box then the air particles would not be evenly distributed. Similarly, humans encounter many things in their environment which affect how the humans will move, keeping them from moving completely randomly.