The reason is that superglue is liquid until it is exposed to the air. The air will contain small amounts of water vapour. The water starts a chemical reaction that makes the glue become solid. This is because the molecules in the glue start to bond together.
Because the glue is sealed in the tube, water vapour can’t get to it. So, it will not solidify. You could try mixing a little superglue with a small drop of water and see what happens. But, be careful that you do this safely and check with your parents first.
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