Why doesn’t glue stick to the inside of the glue bottle?…
Glue is sticky stuff, so it seems like it would stick to the inside of the bottle. But if you do arts and crafts like I do, you know that white glue doesn’t stick until you get it outside the bottle - like when you put it on your fingers and let it dry, then peel it off. Now that’s fun!
I asked some questions and got some answers. Glue has water in it, and when we spread it on something we want glued outside the bottle, the water evaporates, which means it dries up and disappears into the air. When the water is all gone from the glue, the glue sticks.
When glue is in a closed bottle, the water can’t evaporate so the glue stays liquid. That’s why you have to close the lid, or else the glue will dry out and stick to the bottle.
My kids loved the Why Guy DVD. It’s always fun to watch them watch the video!
Comment by David — October 22, 2009 @ 12:25 pm