From this point onward, I have become too busy to post a new tidbit every day. Therefore, in most cases, I will be posting two tidbits every two days instead of the traditional one a day I started with. It's just a lot more convenient for me, and maybe for you guys, too.
Anyways, let's get on with the tidbit.
Remember first grade? Your hardest tests were timed addition tests (7+8, anyone?), recess still existed, and white glue was your duct tape: it could fix anything. You probably never bothered to wonder why the sticky stuff inside the bottle would always be able to slide right down the bottle and not get stuck.
Question: Why doesn't glue stick to the bottle?
Answer: Our friends at Answers.com have this one covered, as usual:
So, what's our summary of the text wall?Another great and puzzling question. Why doesn't glue stick inside of the glue bottle?Glue on paper: As the glue connects with oxygen it becomes sticky and if left to dry in this oxygen it becomes hard and keeps multiple things together.Glue inside the bottle: Glue doesn't stick inside the bottle because the chemicals within the glue is triggered by oxygen (what we breathe) so when the glue bottle is opened it triggers the chemicals to make it sticky. That's why if a bottle if left out with no cap the glue becomes quite hard. (Re: Answers.com)
Normally, glue sticks to paper because the chemicals that make it up become sticky when it crosses paths with oxygen, and dries after awhile and becomes strongly attached to whatever you attached it to. However, if glue is inside the bottle, oxygen can't get to it, and therefore it remains nonadhesive until it comes into contact with any type of oxygen in the air.Here's your condensed summary:
Glue doesn't stick to the bottle because the chemicals in glue only make the glue sticky if it is exposed to oxygen, which isn't inside the bottle.
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