Question

Question No.
The difference in surface tension
between the pure substrate,
(gammal), and that with a film spread
on it, (gamma), is known as:
Answer
A. O surface excess
B. O Surface pressure
c. O surface free energy
D. O Surface potential​

Answer 1

Answer:

C

Explanation:

O surface free energy

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Answer 2

Answer:

C). O surface free energy

explanation

what is mean by Surface Free energy:-

Surface free energy (SFE) is the work that would be necessary to increase the surface area of a solid phase. SFE has a decisive influence on the wettability of solids by liquids. It is therefore an important parameter for the optimization of coating processes, but also for any other type of solid-liquid contact.

why O surface free energy is known as the difference in surface tension

between the pure substrate,

(gammal), and that with a film spread

on it, (gamma) :-

Surface free energy arises from molecular interactions

Term surface free energy describes the excess energy that the surface has compared to the bulk of the material. At the bulk, the molecules have similar molecules on their sides and are pulled equally to all directions.