adhesion 和cohesion的区别？

adhesion and cohesion both refer to "two things sticking to each other", but the difference lies in the nature of the stickiness.

In the word cohesion, by virtue of its prefix "co-", should evoke the notion of "cooperation" -- both surfaces provide the impetus to stick together.

In contrast, adhesion implies only one of the surfaces wants to do the sticking.

Sticking the sticky sides of two pieces of sticky tape together is cohesion. But sticking the sticky side of one piece of sticky tape to a non-sticky, painted classroom wall is adhesion -- the wall doesn't want to stick to anything, but doesn't reject the stickiness of the tape.

附着力：两种不同物质接触部分的相互吸引力。
粘聚力又叫内聚力，是在同种物质内部相邻各部分之间的相互吸引力。