# Boyle Law by liaoqinmei

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Boyle’s Law

Pressure and Volume
Mr. Huff
February 4, 2003
Pressure
Gas particles are in constant motion.
Gas particles collide with each other.
Gas particles collide with the walls of a
container.
The gas exerts a push on the walls of a
container.
Pressure is measured in kilopascals (kPa).
Math Application: Pressure = Force ÷ Area
Volume
Volume is the amount of space that matter
occupies.
Do solids and liquids have volume?
Do gases have volume?
Volume is measured in mL and cm3.
Remember: 1 mL = 1 cm3
Math Application: V = l x w x h
Relating Gas
Pressure and Volume
How can we relate the pressure and
volume of a gas?
What kind of experiment do we need to
develop in order to relate the pressure and
volume of a gas?
Procedure
We will use a syringe connected to a gas
pressure sensor to study the relationship
between pressure and volume.
The syringe will allow us to change the volume
of the gas.
The pressure sensor will monitor the changes in
gas pressure as the volume changes.
Plot the pressure and volume data.
Begin experiment.
Variables
Graphs are diagrams that tell how two
variables are related.
Changes in one variable results in
changes of another variable.
The dependent variable is the variable that
you control.
What is the dependent variable in this
experiment?
Boyle’s Law
When the pressure of a gas increases,
then its volume decreases. ↑P ~ ↓V
When the pressure of a gas decreases,
then its volume increases. ↓P ~ ↑V
Boyle’s Law and Inhalation
The rib cage expands and the diaphragm
moves downward.
The volume of the lungs increases. This
increases causes a decrease in pressure.
The atmospheric pressure is greater than
the pressure in the lungs.
Air flows into the lungs.
Boyle’s Law and Medical
Syringes
The technician draws the plunger out.
The volume of the syringe increases. This
causes a decrease in pressure.
The liquid is at a greater pressure than the
inside of the syringe.
The liquid flows into the syringe.

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