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Buoyancy and Viscosity

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Buoyancy and Viscosity Why are objects easier to lift in water? How is viscosity important in Viscosity is determined primarily by shape of fluid s molecules ... – PowerPoint PPT presentation

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Title: Buoyancy and Viscosity


1
  • Buoyancy and Viscosity

2
Buoyancy
  • Why are objects easier to lift in water?
  • Is it easier to swim in the ocean or in a lake?
    Why?

3
How is viscosity important in
Viscosity
  • Exclusive property of fluids
  • Food production?
  • Drilling fluids?

4
  • Viscosity is determined primarily by shape of
    fluids molecules

Which of these would be more viscous?
Why?
Large, bumpy molecules cause more friction than
small, smooth molecules.
5
Liquid viscosity decreases with increase in
temperature.
  • What happens to hot fudge on your sundae after a
    few minutes?
  • How is the type of motor oil that you use
    affected by the change of seasons?

6
States of Matter
Solids
  • Molecular motion?
  • Shape and volume?

7
Liquids
  • Molecular motion?
  • Shape and volume?

8
Gases
  • Molecular motion and spacing?
  • Shape and volume?

9
Plasma
  • Temporary, high-energy state of molecules
  • Exists on the sun, in neon lights,
    and lightning

http//www.thestormshop.com/clips.htm
10
  • Phase Changes

11
How does temperature affect the state of a
substance?
12
Melting
  • solid liquid

Does size affect melting point?
Different substances have different melting
points.
13
Freezing
  • liquid solid

A substances freezing point and melting point
occur at the same temperature.
14
Boiling
  • liquid gas

Different substances have different boiling
points.
15
Condensation
  • gas liquid

Why does your glass get sweaty?
Condensation and boiling occur at the same
temperature.
16
Sublimation
  • directly from
  • solid gas
  • Can you think of something that sublimes?

17
Deposition
  • directly from gas solid

Example Water vapor in the freezer becomes
frost
18
Heat
19
Pressure also affects state changes.
  • Freezing points are also affected.
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