Adhesion, Cohesion & Surface Tension

Front

What is adhesion?

Back

Adhesion is the tendency of different kinds of molecules to stick together. For example, water molecules sticking to glass.

Front

What is cohesion?

Back

Cohesion is the attraction between molecules of the same substance. For example, water molecules sticking to each other.

Front

What is surface tension?

Back

Surface tension is the elastic tendency of a fluid surface that makes it acquire the least surface area possible. It allows small objects to float on water.

Front

What two elements make up water?

Back

Hydrogen and oxygen.

Front

Why do water droplets form a spherical shape?

Back

Water droplets take a spherical shape due to cohesion, as water molecules are attracted to each other.

Front

What is capillary action?

Back

Capillary action is the ability of a liquid to flow in narrow spaces without the assistance of external forces, often seen when water moves up a thin tube.

Front

Which end of the water molecule has a slightly positive charge?

Back

The hydrogen end of the water molecule has a slightly positive charge.

Front

What is an example of adhesion in nature?

Back

An example of adhesion is water sticking to the surface of a leaf.

Front

What is an example of cohesion in nature?

Back

An example of cohesion is water forming droplets on a surface.

Front

How does surface tension affect small insects?

Back

Surface tension allows small insects, like water striders, to walk on the surface of water without sinking.