Capillarity

[Gabriele]

Hello. If we have a capillary put in water and the first half is in glass and the second in non-stick material and the level of water reach the first half but she would reach the second part too if the capillary was made completely in glass. Now,as i was saying,we put water into the capillary till the top. Will the water flow through the capillary to the base container? Will the level of the water in the capillary move down  till it reach the first half? Thanks.

[profitis]

Can you put this in a diagram for us please

[Gabriele]

Oui,this is the diagramm. In orange anti-stick material,in blue the glass...in light blue the water. If i add water to the upper part of the capillar will the level then decrease? Will the pressure of water do something to system? To decrease a little the level of water?

P.S. I forgot to write that if there weren't the antistick coating the water level would be on the top.

[profitis]

This is really interesting question.I think the level in the tube will stay the same if water flows out bowl.even if level climbs in bowl will stay same level in tube at junction.its the skin tension that makes it so,not the volumes.

[profitis]

Have a look here.the vapour pressure of pure water at top of capillary tube is less than at bottom by exactly weight of column of vapour gas height bottom-top.if we add salt to water its surface tension increase a little,its vapour pressure drop a little,however,its density increase thus at right concentration it will not go as high as it should go.ie.column of water vapour weight will no longer be equivalent to vapour pressure difference.we should get flow of gas vapour from bottom to top perpetuum