Grade 8 Science Unit 3: Fluids &...
Transcript of Grade 8 Science Unit 3: Fluids &...
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GRADE 8 SCIENCE
UNIT 3: FLUIDS &
VISCOSITY
Chapter 7: Viscosity
describes a fluid’s
resistance to flow
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PTM... A REVIEW PG. 270
All matter is made up of
very tiny particles.
All particles in a pure
substance are the same
but different from another
substance.
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There is space between the particles.
The particles are always moving. They move faster if they gain energy.
There are attractive forces between the particles. Some strong; some weak.
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CAN YOU IDENTIFY THE 3
STATES OF MATTER?
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3 STATES OF MATTER... A
REVIEWState Shape Volume Particle
arrangement
Particle
movement
1. Solid Definite Definite Close Vibrate
2. Liquid Indefinite Definite Close Free
flowing
3. Gas Indefinite indefinite Far Apart Random
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FLUIDS
Any form of matter that flows.
Since liquids and gases do NOT have a definite shape they are able to flow making them fluids.
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WE USE FLUIDS EVERYDAY.
FOR EXAMPLE...
Food fluids (water, oil, maple
syrup, honey, etc)
Cleaning fluids and creams
Bodily fluids
Industrial fluids (compressed
air in tires, lubricants, etc)
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VISCOSITY
A measure of a liquid’s resistance to flow.
The thickness or thinness of a fluid.
A fluid that is viscous is the one that is NOT “runny” (flows slowly).
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VISCOSITY & FRICTION?
Friction resists movement.
The greater the friction, the greater the viscosity.
The particles are holding on tightly to each other.
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VISCOSITY IS IMPORTANT IN
OUR EVERYDAY LIFE.
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FLOW RATE
The speed at which a
fluid flows from one point
to another.Slow Medium Fast
Corn syrup Dishwashing
liquid
Water
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TH
EF
LO
WR
AT
EO
FL
IQU
IDS
Core
La
b A
ctivity
7-2
B p
g. 2
82-3
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FACTORS THAT AFFECT
VISCOSITY
Temperature:
As you increase temperature, you decrease a fluid’s viscosity. As you decrease temperature, you increase a fluid’s viscosity.
The opposite is true of gases.
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Concentration:
The amount of a
substance dissolved in a
specific volume.
Increasing the
concentration, increases
the viscosity.
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Attractive Forces:
If the attractive forces
are strong, it is difficult
for the particles to pull
away thereby the fluid
flows slowly and is more
viscous.
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Particle size:
The smaller the particle
size, the faster the fluid
flows and is less viscous.