Timeline for Surface tension on a film
Current License: CC BY-SA 4.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Oct 2, 2020 at 13:06 | vote | accept | user270071 | ||
| Oct 2, 2020 at 11:12 | comment | added | John Rennie | @user270071 suppose you have the liquid in a container, then the only way you can increase the area is to make the container wider and that makes the liquid shallower. What happens is that some of the water molecules that were in the bulk of the liquid have now moved to the surface. When those molecules migrate from the bulk to the surface their energy goes up and that is what causes the increase in the interfacial energy. Or another way to look at it is that the interfacial energy per molecule at the interface is constant, and you are increasing the number of molecules at the interface. | |
| Oct 2, 2020 at 10:06 | comment | added | user270071 | There are two ways to increase the area of the interfacial surface , one is when we pour the liquid in a wider container . And other way is the same as i stated in the question i.e. film area expansion . In the former case the no. of molecules can increase or decrease on the interface but in the other case when we increase the film area how do the molecules manage to increase so as to maintain the value of surface tension constant | |
| Oct 2, 2020 at 9:10 | history | answered | John Rennie | CC BY-SA 4.0 |