First of all, I want to ask for your understanding for my not well English. I want to discuss all the effects will take place if we begin applying vacuum to the following system http://www.inkline.gr/temp/Vacuum-ElasticTube.gif . Data: The tube is elastic (squeezable) The chamber is rigid The tube contains tap water and it's closed at the right end The final vacuum supposed to be about -0.9 atm (the water don't boil in this pressure at ambient temperature) When I apply vacuum to the actual system happens a strange thing: the water brim over the open end. Why? After a bit an air bubble is formed inside the tube (the bubble is about 1/10 of the total tube volume). Why? When I apply a vacuum about 0.75 atm the above effects are 10 times less.