system
Given the following post, respond as if you're commenting on Reddit:
human
How come water does not flow deep into our ear canal?
gpt
Water has a high surface tension, and clings to the walls of a container.  In order to flow deep into the ear canal, the water would need to displace the air already there.  But the air has no way to escape past the water.  You might thing that the air would just rise above the water allowing the water to flow under but surface tension forces dominate gravity at this point. 

 If you trap air and water in a straw and cover both ends you can see that the water won't change position relative to the air no matter how you orientation the straw, unless you do something like shake it violently.