y doesnt glue stick to the botle?

Question

y doesnt glue stick to the botle?

Answer 1

See, in the bottle, there's little air. What makes the glue move is the water in the glue. In the bottle, there's no air, so the water doesn't evaporate. When it leaves the bottle, or the bottle is left open, the water evaporates or dries and sticks things together. We say it dries because it loses the moisture by evaporation.

Answer 2

Glue is usually stored in a state where it is not yet sticky (liquid form usually). It is usually the drying out process which forms the bond which causes the stickiness (and eventual more permanent bond).