Why does glue stick things together?
Show answer & explanation
Answer: Molecules bond to surfaces
It melts surfaces together — Wrong. Glue doesn't melt materials. It works by forming molecular bonds with surfaces while remaining a separate substance.
Molecules attract magnetically — Wrong. Glue has no magnetic properties. The sticking power comes from chemical and mechanical bonding.
Molecules bond to surfaces ✓ — Correct! Glue molecules form chemical bonds with surface molecules (adhesion) and with each other (cohesion). Some glues also seep into tiny pores, creating mechanical locks. Different glues use different bonding methods!