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 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!
Molecules attract magnetically — Wrong. Glue has no magnetic properties. The sticking power comes from chemical and mechanical bonding.