some imp. pts abt. surface tension.....

 

On adding detergent to a liquid ,its surface tension as well as viscosity decreases

 

On increasing the temp. surface tension decreases

 

on inc. the temp. viscosity pf liquids decreases but that of gases increases

 

critical temp. is the temp. at wich surface tension of the liquid becomes zero

 

Bigger drop is nt spherical in shape bcoz of gravity

 

the liquids having lesser surface tension spreads more on surface

 

Oil spreads in the form of layer on cold water surface however it remain like a drop  on hot water surface bcoz S.T. of oil is lesser than cold water and greater than hot water

 

Hair of a brush (say painting brush) ,  wen dipped in water spread out but as soon as it is taken out , the hairs cling together bcoz a thin water film is formed at the tips of the hair wen taken out and then the surface film contracts due to surface tension aquire min. surface area and hair cling together

 

small liquid drops are spherical in shape bcoz fr a given vol. , a sphere has the least area

 

if an irregular piece of camphor is floated on the surface of pure water , it doesnt remain steady but dances about on the surface......................

 

 steel is more elastic than iron

 

normal stress can never produce shear strain and tangential stress can never produce longitudnal or volumetric strain

 

 a long thin wire has max. extension fr a given load