Buoyancy and Viscosity

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• Buoyancy and Viscosity

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Buoyancy

• Why are objects easier to lift in water?

• Is it easier to swim in the ocean or in a lake?
  Why?

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How is viscosity important in
Viscosity

• Exclusive property of fluids

• Food production?

• Drilling fluids?

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• 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.
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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?

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States of Matter
Solids

• Molecular motion?
• Shape and volume?

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Liquids

• Molecular motion?
• Shape and volume?

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Gases

• Molecular motion and spacing?
• Shape and volume?

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Plasma

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

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

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How does temperature affect the state of a
substance?
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Melting

• solid liquid

Does size affect melting point?
Different substances have different melting
points.
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Freezing

• liquid solid

A substances freezing point and melting point
occur at the same temperature.
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Boiling

• liquid gas

Different substances have different boiling
points.
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Condensation

• gas liquid

Why does your glass get sweaty?
Condensation and boiling occur at the same
temperature.
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Sublimation

• directly from
• solid gas

• Can you think of something that sublimes?

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Deposition

• directly from gas solid

Example Water vapor in the freezer becomes
frost
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Heat
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Pressure also affects state changes.

• Freezing points are also affected.