1. 8.3 Viscosity, Adhesion, and Cohesion
Viscosity is the resistance of a fluid to flow.
Some fluids flow more easily than others because:
Particles of different fluids have different shapes.
Particles I some fluids are attracted to each other more strongly.
The flow rate is the speed at which a fluid flows from one point to another.
The slower the flow rate the greater the viscosity.
Oil has a larger viscosity than water, therefore oil has a slower flow rate.
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2. The Effect of Temperature on Viscosity
Temperature effects the viscosity of materials as follows:
Liquids
Heated viscosity decreases
Cooled viscosity increases
Gases
Heated viscosity increases
Cooled viscosity decreases
Temperature effects how easily a liquid pours.
See page 302
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3. Adhesion and cohesion affect the flow rate of liquids.
Adhesion is the attraction of two different objects or fluids to each other.
Cohesion is the strength with which the particles of an object or fluid attract each other.
Surface tension is the property of a liquid in which the surface of the liquid acts as a thin skin due to cohesion.
The water’s surface tension allows this insect to remain supported.
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Take the Section 8.3 Quiz
(c) McGraw Hill Ryerson 2007