Concept Summary

1

Liquids

• Concept Summary
• Batesville High School Science

2
Pressure

• Pressure depends on
• The applied force - more force means more
  pressure
• The area over which the force is applied - more
  area means less pressure
• Force moves you - pressure determines how it
  feels.

3
Pressure

• Pressure force/area
• Common units of pressure
• English system lbs/in2 (ppi)
• Metric system 1 Newton/m2 1 Pascal
• 1 kiloPascal 1000 Pascal

4
Liquid Pressure

• The force a liquid exerts on the bottom of a
  container equals the weight of the liquid.
• The pressure a liquid exerts on the bottom of a
  container depends only on the density of the
  liquid and the depth of the container.
• Pressure weight density x depth

5
Buoyant Force

• Objects immersed in a liquid experience an
  upward buoyant force.
• The buoyant force is due to the difference in
  pressure (and force) on the top and bottom of the
  object.

6
Archimedes Principle

• The buoyant force on an object equals the weight
  of the liquid displaced (moved out of the way) by
  the object.

7
Sinking Floating

• If you put an object into a liquid, it
• Sinks if the object is more dense than the
  liquid.
• Floats if the object is less dense than the
  liquid.
• Neither sinks nor floats if the object has the
  same density as the liquid.

8
Principle of Flotation

• A floating object displaces a weight of liquid
  equal to its own weight.

9
Pascals Principle

• A change in pressure at any point in a confined
  liquid is transmitted undiminished to all points
  and all directions of the liquid.

10
The End