Question

classify each of the following as examples of cohesion (c), adhesion (a), or surface tension (st). 2. meniscus formation 3. water drops on a penny 4. spherical raindrops forming 5. a water strider walking on water 6. dew drops on plant leaves 7. wetting of a surface

Explanation:

1. Meniscus formation is due to both adhesion (water - glass interaction) and surface tension. But mainly surface tension causes the curvature, so ST.
2. Water drops on a penny stay together due to cohesion between water molecules, so C.
3. Spherical raindrops are formed because of surface tension which tries to minimize the surface area, so ST.
4. A water strider walking on water is because of surface tension creating a 'skin' - like effect on the water surface, so ST.
5. Dew drops on plant leaves are due to cohesion of water molecules, so C.
6. Wetting of a surface is an example of adhesion where water molecules stick to the surface, so A.

Answer:

1. ST
2. C
3. ST
4. ST
5. C
6. A