- How exactly does the capillary action work in this case?
I have observed the following phenomenon:
Step 1: Dunk the pipette into the solution.
Step 2: Press it and hold it pressed.
Step 3: Pull out the pipette, until the lower end is in the air.
Step 4: Release the pressure.
Now one would expect that the solution in the pipette sucks bubbles of air. However, it does not. The solution in the pipette climbs as if there was still a fluid to suck in. Why? O.k. it is presumably capillary action which is responsible, and the fluid has to climb until the pressures are equalized. But where are the bubbles?