Adhesion: What it’s called when one substance sticks to a different substance.
Cohesion: What it’s called when a substance sticks to itself.
Glue: A sticky substance used for holding objects together.
Peeling strength: The resistance to peeling that something like tape has from a surface. A test of peeling strength is done with adhesive applied to another surface, with the “peel” done at a 90° angle.
Tensile strength: The strength a material has to resist being pulled apart. If you glue something to the ceiling, the weight of the object tests the glue’s tensile strength.
Shear strength: The resistance to being slid from side to side. This tests the strength of the adhesive or glue when it is used to attach parallel surfaces, and then force is applied until the surfaces slide apart.