why does superglue not stick to the inside of the tube?
546333
It hasn't been exposed to air yet. It takes air to harden.
169839
The chemical reaction to 'bond' two substances requires oxygen and the tube is "sealed" to keep most air out. It is not totally air tight however because if you let it go to long it will dry out in the tube. Also a little does stick to the inside but you never know it because you just assume the tube is empty and throw it out.
970820
Glue doesn't stick to the inside because in order to dry, glue must lose its moisture, and it cannot while still inside of the bottle.  Leave the top off and the whole thing will dry out and get stuck\n\nFlies get inside of the lights because they aren't sealed air tight
794120
you could take a straw and heat to just before the melting point where it starts to get soft. you could also use a small gauge (meaning the wire is thick) and bend that. Then attach the tube worm to that so it looks like some of it is sticking out.
983144
interior of cup expands faster than exterior of cup due to poor thermal conductivity of the cup material.\n\nglasses that are thin enough will not suffer this problem because heat can conduct thru thin materials easily so that thermal expansion is more or less equal on the interior and exterior.\n\nyou can also force one of your glasses to break by cooling the glass with ice water, dumping the ice water away and then dousing the glass with boiling water. try not to hurt yourself.\n\nbicycle tire ruptures due to a simpler explanation. the tire cannot withstand increased pressures that occur when a gas is heated in a closed system. (gay-lussac law)
479899
I think super glue needs a little bit of moisture to react, which may not be present in large enough quantities to do the job in a vacuum.  It would be worth trying, though. An alternative might be an epoxy.  The constituent parts may be non-volatile enough to work in a vacuum, depending on how long they are in said vacuum.  Of course, neither is easy to remove.  \n\nA description of the surfaces you need to stick together, how long they need to be stuck, etc., might help.
119855
Elevating the temperature will typically increase the cure rate.  It is best to follow the manufacturer's recommendations.  Sometimes if the cure is too fast, it will not adhere optimally.  (the bonds are formed too quickly, and not to the substrate).
37625
I used superglue to build a minature bridge out of toothpick for a class.  It weighed the least amout of all the bridges in the class and it held the brick (which was the assignment).  If you don't care about the weight other glues will work, but the will absorb into the wood more and make your bridge heavier.  Also, work on an old surface that it is okay to get glue on.  I had to use a razor blade to get it off my desk.  Using my desk helped make it straighter and stronger.  Good luck.
236052
gorilla glue! \nor possibly rubber cemente
1041638
The moisture in the "glue" must evapourate before it can bond.  The inside of the container is not airtight, however there is insufficient air and heat to facillitate evaporation.  Hence, the "glue" is kept in liquid or solid (as in the case of a glue stick) form.  Also, the containers are plastic which doesnt have high affinitiy for many chemicals, further reducing bonding.
662607
the liquid that is the adhesive requires the solvent to evaporate and allow it to cure. That is why it does not set in the tube while it is sealed
525016
when they fill the tube they have 3 things that insert the paste. the gelly like paste just squeezes out and seems to be hard to mix together. if your tried hard enough, you could eventually mix it up and it would come out all muddy colored. but theres really nothing special to it.
867761
uncles a chemist, melt it HELLA HOT, ones more dense than other so if its in a tube one will go to the top and one will go to the bottem, then go for it. good luck\nemail me for problems hjrboy7896@hotmail.com
205650
if you pour it carefully, it should stick together.  Water has a great degree of chemical cohesion, but it's not strong enough to keep the blob together if it has a lot of internal momenti.  If the blob comes out with some varying momentum vectors (if one part of the blob is moving one way and another moving another way), then it will break apart into a few blobs.  If you use a standard water bottle with a thin neck, odds are it's going to come out in a few chunks as the water comes out and the air alternately comes in to fill the space (glug glug glug)\n\nAnd to correct one of the answers, water is not attracted to itself due to its own mass.  Neutral mass only has attractive forces at very large scales (gravity).  Water cohesion and surface tension has to do with the polar nature of the water molecule.  Water molecules are bent with a positive and negative end that form, and while the positive and negative attractions more or less cancel out in the middle of a mass of water, at the surface the bonding is stronger because the molecules are essentially fighting to get back in the middle.  At the surface, there are fewer directions that a water molecule can orient itself without causing unchecked electromagnetic charges (which nature abhors), so they have to orient themselves in a structured 2-dimensional manner at the surface so that each positive end is facing towards the negative end of another water molecule.  This high degree of structure at the surface creates what we know of as surface tension.  It's the force that keeps beads of water on the windshield from spreading out.  It's relatively strong, but for a large mass of water like what would come out of a bottle, the internal momentum of different sections of the blob would far outweigh the forces of cohesion and surface tension.\n\nPicture a big wobbly amoeba, except if an arm stretches out too far, it breaks off into another little blob.\n\nBut if you managed to pour it out REALLY carefully, or if you injected small drops into the air with a syringe, you would get spheres, because there wouldn't be ebough mass of water for any internal momentum to override the surface tension.  And the surface tension would, in fact, make water assume a spherical shape in zero-gravity.
19625
oxygen? most glue that i am aware of requires oxygen to catalyze the "gluing" process. glue goes bad and solidifies in the bottle if the cap is left open.
725476
put some gold bond powder down there.... hopefully it will not turn into some sort of paste
987176
I can't say for certain, but I assume the length of the gaps does not increase.  The length of the tubes increase so that the time it takes to traverse the tube stays the same.  I think the only constraint on the gaps is how close the tubes can be to each other.  You'd want it to be as small as possible to get as much accelleration as possible.