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Hello everybodyThis is my first topic here and i would like to share knowldege with all of youmy question is about surface tensionif we do have a film ( two different plastic film ) and then we put a drop of water on the first one and another drop on the second one , the water drop might do one of these:1- the drop will stay as a drop on the film2- the drop will spread on the film1- Why the drop stay as a spherical drop in first part of the question and why it spreads in the second part ?2-Could you explain to me what is the realation of the surface tension in the two questions ?3-is the surface tension a property for the water or even for the solid (plastic film) ?I am looking forward to hear from youRegards
Thanks for replying but it is still not very clear for me1- if the drop wets the surface: does that mean the surface tension of the liquid or of the solid is bigger ? or is it equal ?2- if the drop does not wet the surface: does that mean the surface tension of the water is bigger than the solid ?Please try to make it easier and clearThank you very much
Ok:: i just want to make sure that i understand what you are trying to say here1- the onely thing might change is the contact angle between the drop and the surface.. but how we explain that when someone says he needs to measure the surface tension of his liquid sample with different solids..
2- How we can calculate the surface tension if we do have the contact angle ?
Dear lightarrowi have some more questions:1- if i do have different solid materials and need to make them as films and then see if the liquid (water drop) wets the surface of not, how would that be ? in other words :it is an idication to see if the surface is hydrophilic or not..
2- Do you think this is an indication for the surface tension or not ? if yes: could you explain it please ?