Applied Physics I: Chapter 2: Properties of Matter - Viscosity and Surface Tension
Viscosity
Definition, Explanation, Classification of viscous liquids
Viscosity or internal friction of the liquid is the property of a liquid by virtue of which the liquid opposes the relative motion between its different layers.
VISCOSITY
Definition:
Viscosity
or internal friction of the liquid is the property of a liquid by virtue of
which the liquid opposes the relative motion between its different layers.
Explanation:
When
a liquid flows slowly and steadily over a fixed horizontal surface ((i.e)
stream line flow) as shown in Fig.2.1, then the velocity of each layer of liquid
increases with its distance from the fixed surface as shown.
Let
us consider a layer AB of the liquid. The layer below AB moves slower than the
layer above AB. The difference in velocity will give rise to internal friction.
As
a result the fast moving layer tends to accelerate the slow moving layer and
the slow moving layer tends to deaccelerate the fast moving layer. Thus a
temporary resistance is offered by the liquids to the shearing stress called as
viscosity.
Classification
of viscous liquids:
In
general the viscous liquids are classified into two types, viz.
(i) High viscous
liquids: Thick liquids such as castor oil,
honey, coal tar, glycerine etc. are examples for high viscous liquids.
(ii) Low viscous
liquids: Thin liquids such as water, alcohal,
spirit, kerosine, oil etc. are examples for low viscous liquids.
Applied Physics I: Chapter 2: Properties of Matter - Viscosity and Surface Tension : Tag: Applied Physics : Definition, Explanation, Classification of viscous liquids - Viscosity
Applied Physics I: Chapter 2: Properties of Matter - Viscosity and Surface Tension
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