Surface Phenomena

Question 1

What is surface tension

Answer 1

Measurements of cohesive energy present at an interface
- It gives effect within the surface layer of a liquid that causes the layer to behave as an elastic sheet/ behave as an elastic rubber membrane under tension

Question 2

Interface

Answer 2

Boundaries between two or more phases (solid, liquid ,gas) exist together

Question 3

Example for surface tension

Answer 3

Walking on water
:Water strider can walk on water because their weight is not enough to penetrate the surface

Flooring of paper clip
:Even though clips is density compared to water but it still can be floated if it is placed carefully on water. If the water was agitated the clips will shrink slowly

Soaps and detergent
:It lowers the surface tension of the water which allows the water to penetrate the materials more easily

Question 4

symbol and unit of surface tension

Answer 4

y(gamma, unit: dyne/cm or N/m.

Question 5

Surface tension formula

Answer 5

T = F/ effective length

Question 6

Capillary action

Answer 6

result of a combination of adhesion and cohesive.
-Ability of a liquid to flow in narrow spaces, without the assistance of, and in opposition to external forces like gravity