Matter, Fluid Mechanics

1
Chapter 11,12

• Matter, Fluid Mechanics

2
States of Matter

• Solid
• Liquid
• Gas
• Plasma

3
Solids

• Has definite volume
• Has definite shape
• Molecules are held in specific locations
• by electrical forces
• vibrate about equilibrium positions
• Can be modeled as springs connecting molecules

4
More About Solids

• External forces can be applied to the solid and
  compress the material
• In the model, the springs would be compressed
• When the force is removed, the solid returns to
  its original shape and size
• This property is called elasticity

5
Crystalline Solid

• Atoms have an ordered structure
• This example is salt
• Gray spheres represent Na ions
• Green spheres represent Cl- ions

6
Amorphous Solid

• Atoms are arranged almost randomly
• Examples include glass

7
Liquid

• Has a definite volume
• No definite shape
• Exists at a higher temperature than solids
• The molecules