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```									     Gay-Lussac’s Law

Identifying the Relationship between
Temperature and Pressure
Introduction
• Why do tires on 18-wheel trucks explode on
long summer trips?
• Think about the temperature of the air.
• Think about the contact between the tires
Key Concepts
• “Temperature is the         • “The pressure of a
measure of the                gas is the force of its
average energy of             outward push
particles of                  divided by the are of
substance.”                   the walls of the
• Greater energy results in     container.”
greater particle motion.    • Pressure is the outward
This corresponds to an        push that a gas exerts on
increase in temperature.      the walls of a container.
Hypothesize
• An increase in temperature causes an
increase in pressure. This increase in
temperature can cause tires to explode.
• How would a decrease in
temperature affect the tire pressure?
Exploration
• In this activity, you will use instruments to
determine the relationship between gas
temperature and pressure.
• You will accomplish the exploration using
the TI Voyage calculator, TI Calculator-
Based Laboratory (CBL2), gas pressure
sensor, and temperature sensor.
TI Voyage Calculator
Calculator-Based Laboratory 2 (CBL2)
Stainless Steel Temperature Sensor
Gas Pressure Sensor
Student Roles
• The reporter writes down all of the
temperature and pressure value that are
obtained during the experiment.
• The temperature analyst is responsible for
the temperature sensor. This analyst hold
the black part of the sensor and keeps the
metal part in the water at all times.
Student Roles Continued
• The pressure analyst is responsible for the
the pressure sensor and the glass test tube.
• The technician is responsible for operating
the calculator. The technician also adds ice
to the water and stirs the water.
Procedure

• Turn on the calculator
by pressing [ON].
Procedure

• Type datamate().
• Press [ENTER].
Procedure
Insert the
stopper.

• Insert the rubber stopper into the test tube.
• Make sure that the air valve is open.

The valve
is open.       stopper
Procedure
open
valve

closed
valve
Procedure
real-time
temperature
and pressure
data

Record the real-time temperature and pressure
data from the main screen of the DataMate
program.
Procedure
test tube/rubber stopper

• Submerse the test
tube/rubber stopper
into the water.
• Do not allow the water
to touch the rubber
stopper.

temperature sensor
Procedure

• Allow the temperature and pressure readings
to stabilize.
• Record the temperature and pressure values
from the upper right corner of the screen.
Procedure

• Add ice to the water
and stir.
• Allow the ice to
completely melt.
• When the ice has
melted, allow the the
data values to
stabilize and record
the values.
Procedure
DATA TABLE
Temp. (C)        Pressure (kPa)

ice, allowing the
pressure and
temperature
values to
stabilize, and
recording the
values.
Observation
• Analyze the temperature and pressure data
in the Data Table.
• What happens to the pressure when the
temperature decreases?
• Does this observation support or disprove