Identifying the Relationship between
Temperature and Pressure
• 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
• “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.
• 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?
• 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
• 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.
• Turn on the calculator
by pressing [ON].
• Type datamate().
• Press [ENTER].
• Insert the rubber stopper into the test tube.
• Make sure that the air valve is open.
is open. stopper
Record the real-time temperature and pressure
data from the main screen of the DataMate
test tube/rubber stopper
• Submerse the test
into the water.
• Do not allow the water
to touch the rubber
• Allow the temperature and pressure readings
• Record the temperature and pressure values
from the upper right corner of the screen.
• Add ice to the water
• Allow the ice to
• When the ice has
melted, allow the the
data values to
stabilize and record
Temp. (C) Pressure (kPa)
• Continue adding
ice, allowing the
• Analyze the temperature and pressure data
in the Data Table.
• What happens to the pressure when the
• Does this observation support or disprove
Applications of Gay-Lussac’s Law
• Tires bursting due to high temperatures
• Pressure cookers
• Autoclave Medical industry sterilization
with water vapor under pressure