Surface Tension behaves as if it were covered by elastic skin.
The effect on the surface is called the surface Tension.
A needle with density greater than H2O,if placed genthy on the surface of water will rest there as if is supported by this elastic skin
Weight of needle
A needle floating on water .
*• Two types of forces.
Cohesion is the Force of a attraction between molecules of the sanf substance is called cohesion .
Adhesion is the Force of attraction between molecules of different substance is called adhesion.
3.Capillarity is the tendency of liquid to raise or fall from the capillary tubies .Methods of reducing surface.
Adding kerosene or petron
Adding Oil
Adding Comphor
Adding alcohol
Adding soap or Aetergent to the liquid.
Fricreasing the temperature of the liquid.
*. Capillary depends on surface tension.
(i) The use of clothing paper to obsorb ink.
(ii) The rsie of oil in lamp and the droving up of methods wax into the wick of a buring candle are due to capillary.
Effect of surface tension.
- In seds walk across the water surface.
- Mercuring gathers into a small droplets when split .
- A dry steel needle may be made with Carre to float on water .
- A drop water may reman suspended for some time from a tap before falling.
- Hairs of a wet painting brush cling together.
