Saved Bookmarks
| 1. |
What is the dimensions of surface tension |
| Answer» Surface Tension\tSurface tension is the property of the liquid surface which arises due to the fact that surface molecules have extra energy.\tSurface energy is the extra energy which the molecules at the surface have.\tSurface tension is the property of the liquid surface because the molecules have extra energy.\tSurface energy is defined as surface energy per unit area of the liquid surface.\tDenoted by ’S’.\tMathematically :-\tConsider a case in which liquid is enclosed in a movable bar.Slide the bar slightly and it moves some distance (‘d’).There will be increase in the area, (dl) where l=length of the bar.Liquids have two surfaces one on the bar and other above the bar. Therefore area=2(dl)Work done for this change =Fxdisplacement.Surface tension(S)=Surface Energy/areaOr Surface Energy=S x area=Sx2dlTherefore S x 2dl =F x d\t\t\tS = F/2d | |