2006-11-22 07:07:40 · 16 answers · asked by michael 2 in Science & Mathematics ➔ Other - Science
Because there isnt much air inside the tube. Its the air that dries/sets the glue...;
2006-11-22 07:10:32 · answer #1 · answered by huggz 7 · 2⤊ 0⤋
Glue only becomes sticky and hardens in the presence of oxygen. When it is in the tube, oxygen does not get in. However, if there's some glue that has spilt out of the tube present and the lid was closed, this glue will oxidise and hence you find it difficult to open the cap of the tube.
2006-11-26 04:33:43 · answer #2 · answered by Kemmy 6 · 0⤊ 0⤋
Its because air is needed to dry the glue.
If you were to take the cap off the glue and leave it then it would definatly stick in the inside.
2006-11-22 07:16:20 · answer #3 · answered by Beautiful - 6 · 0⤊ 0⤋
adhesive is a sticky stubstance that sets, thys you cant use honey as a glue, for it remains runny. inside the tube there is no air, so the contents remain runny.
The oldest glues are based on the hot liquid gelatine of animal parts, and are set as they cool.
water based glues dry, by evaporating the water, so they need to be in open dry air to set, and will remain liquid in the tube.
resins are kept liquidwith volitile solvents, which evaporate in the air.
some resins have to be mixed to activate, and will then produce heat and evaporate the solvents within them.
2006-11-22 07:15:25 · answer #4 · answered by DAVID C 6 · 0⤊ 0⤋
because glue is made to react with the air so cos there is no air in the tube it does not go solid or stick only with air does it stick and go hard .
2006-11-22 07:10:52 · answer #5 · answered by Anonymous · 1⤊ 0⤋
Ordinary glue doesn't stick to anything until the solvent evaporates out of it. In the tube, there's no place for the solvent to evaporate to...
2006-11-22 07:12:16 · answer #6 · answered by Steve 7 · 0⤊ 0⤋
when exposed to the air glue reacts with the atmosphere , the chemical reaction causes the glue to change its properties and starts to get tacky until it is at a stiff consistency
2006-11-25 06:09:05 · answer #7 · answered by DANDAN 1 · 0⤊ 0⤋
Leave the cap off and it will, most glues need air to dry thats why you replace caps ddddooooooo
2006-11-22 07:16:12 · answer #8 · answered by GLYN D 3 · 0⤊ 0⤋
It does, when it dries out. You have to realise that adhesives are stored in containers the contents of which are not designed to stick to.
2006-11-26 06:55:18 · answer #9 · answered by Spanner 6 · 0⤊ 0⤋
Isn't it because it needs oxygen in order to stick to a surface ?
2006-11-22 07:09:55 · answer #10 · answered by Jazz 4 · 1⤊ 0⤋