Chapter 7 Intro to Fluids

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Fluids
• A fluid is any form of matter
(substance) that flows.
Particle Theory
• A review of the five major points of the
particle theory of matter:
• 1. All matter is made up of very small particles.
• 2. All particles in a pure substance are the same. Different
substances are made of different particles.
• 3. There is space between the particles.
• 4. The particles are always moving. As the particles gain
energy,
• they move faster.
• 5. The particles in a substance are attracted to one another.
Solids, Liquids and Gases
• The strength of the attractive force depends on the type of
particle.
Solids
Liquids
Gases
Shape
Definite
shape
Indefinite
shape
Indefinite
shape
Volume
Definite
volume
Definite
volume
Indefinite
volume
Particle
arrangement
Particles
close
Particles
close
Particles
distant
Particle
movement
Vibrate in
place
Free
flowing
Random
movement
Solids, Liquids and Gases
Even though a
solid does not appear to
move,
the particles are constantly
vibrating in place.
The particles in a liquid
are in contact with each
other, but they can slip
and slide past one
another, changing their
position. This slipping and
sliding means liquids take
the shape of their
container.
Gas particles have very
large spaces between
them. from liquids and
solids. Particles in a gas
can move freely in all
directions. This is why
gases always spread out
or diffuse in their container
Fluids:Liquids and Gases
• Since liquids and gases do not have a
definite shape they are able to flow.
Hence by definition, liquids and gases
are fluids.
• Some examples of fluids in everyday
life:
(i) compressed air in tires
(ii) water
(iii) syrup
Other Fluid Examples
Other examples include:
• - food fluids (syrup, honey, molasses, water,
or oil.)
• - cleaning fluids (shampoo, liquid detergents,
gels, abrasive creams like Vim™)
• - bodily fluids (blood, mucus)
• - industrial fluids (oils as lubricant,
compressed air in tires)
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