Pulling glasses apart

When you put a thin layer of water between two sheets of glass it’s hard to separate them. When two objects made of the same material are in contact with each other, the force acting between the molecules of the surfaces in contact is called cohesive force. However, when two objects of different materials remain in contact, the force between molecules of the surfaces in contact is called adhesive force. How strong are these forces Sometimes they are so strong that they may appear to challenge even persons of great physical strength. In this paper we shall use a drop of water to make two thin slides stick to each other, and study these forces

کلیدواژه ها:

Capillary force ، Atmospheric pressure ، surface tension