We’ve all used Elmer’s glue before in school or for various art projects. If you’re like me you’ve often wondered “hey wait, why does this glue not stick to the bottle but the minute it comes out it sticks to everything?!”
The reason for it is when white glue is inside a bottle, there’s not enough air inside the bottle to cause the water to evaporate to make the glue sticky. The bottle actually protects the glue from the air and keeps the glue runny. Then when the glue leaves the bottle it reacts with water vapor in the air to make it stick to things.
Science!
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