Viscosity, Capillarity, Surface Tension

Viscosity, Capillarity, Surface Tension

VISCOSITY

Frictional force acting between parallel layers of a liquid is called 
Ans : Viscosity 
Unit - Poise
With increase in temperature, viscosity 
Ans : Decreases
Viscosity of gas is less than viscosity of 
Ans : Liquid
Viscosity of an ideal fluid is 
Ans : Zero

MOBILE LIQUIDS

Liquids having low viscosity are called 
Ans : Mobile liquids 
Mobile liquids can flow easily 
eg : Water, Kerosene, Alcohol, Petrol etc

SUPERFLUIDS

Fluids flow with zero viscosity is called
Ans: Super fluids
It shows antigravitational property 
eg : Honey, Coal tar, Glycerine etc

SURFACE TENSION

 
The property of a liquid by which the free surface of liquid acts like a stretched membrane
Ans : Surface tension
Surface tension is caused due to
Ans : Unbalanced molecular cohesive force
Surface tension is inversely proportional to temperature and
Ans : Pressure
Surface tension of hot water is less than that of
Ans : Cold water

APPLICATIONS AND EXAMPLES

Insects to walk over the water surface
Spherical shape of rain drops
Detergents inverse the surface tension of water

CAPILLARITY

It is the phenomenon of surface tension 
eg : rise of water level in plants
: The chalk and blotting paper quickly absorb ink
It is due to adhesive force