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Concept Summary
Batesville High School Science
Pressure
 Pressure
 The
depends on:
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.
Pressure
 Pressure
= force/area
 Common units of pressure:
system: lbs/in2 (ppi)
 Metric system: 1 Newton/m2 = 1 Pascal
 English

1 kiloPascal = 1000 Pascal
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
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.
Archimedes’ Principle
 The
buoyant force on an object equals
the weight of the liquid displaced
(moved out of the way) by the object.
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.
Principle of Flotation
 A floating
object displaces a weight of
liquid equal to its own weight.
Pascal’s Principle
 A change
in pressure at any point in a
confined liquid is transmitted
undiminished to all points and all
directions of the liquid.
The End
