ok maby you do will be surprised, but I guess you are quite right with your statements, but we are a talking about the negative pressure in a capillary, and it seems you overlooked this, so watch the long version video until you answer again and now I bet you do not address this in your next responses
If I am right with my statements then there is no circulation, no perpetual motion and no violation of conservation of energy. Also if I am right with my statements, negative pressure does not need to be considered, since my explanation makes no mention of this.
The main thing is it seems we are now agreed about the answer to the question originally posed in this thread. Good.
I shall indeed not be watching the YouTube video. So you win your bet on that
If however you can explain in your own words why you think -ve pressure is important I will be happy to comment on what you have to say. For the time being, the way I would comment on this is that, immediately under the liquid surface within the capillary, the pressure is slightly below atmospheric. This is because of the upward force due to surface tension that I have been talking about, which partially offsets the air pressure above the meniscus. The rise of liquid up the tube can be seen as due to this pressure reduction. In a tall tube, the height of liquid that rises up the tube is a measure of the degree of pressure reduction: the rise will stop when the pressure reduction at the top is exactly counteracted by the extra weight of water lifted up the tube. (In a very short tube this may not be true, as you may then find the meniscus reaches the top and then stops due to the change in direction of the previously upward force into a predominantly lateral one, as I described earlier.)
So you can consider this problem from the viewpoint of pressure if you like, though it is not necessary to do so, as shown by my earlier explanation of it.
Edited by exchemist, 18 February 2017 - 02:34 AM.